So I've been in debate and public speaking for a decade now. Here's a few tips. Oh and I'm blind too.

Body language pointers when public speaking:
* Keep hand gestures to a minimum. If you talk with your hands a lot try to keep the movements sharp and purposeful. Listing things on your hands can be good but just waving them around looks messy.
* Don't shift weight from foot to foot. This makes you look indecisive.
* Make sure your head is not tilted to the floor. You ideally wanna make eye contact (but I can't either) so instead just try to keep your chin up
* Don't fidget with your cane or objects in your hands. It makes you look unfocused.
* Never cross your legs. When standing and crossing legs you look like you need to pee and it's unstable. When sitting and crossing legs you look like you're trying to take up a small amount of space and that is seen as timid. Even girls.
* keep your back straight. Every time you think of it you should audit your body. Is my back straight? If it's not straight correct it. This also helps with back pain.
* When sitting keep your hands open and out of pockets or bags. If there's a table in front of you then you can leave your hands on the table. If you're standing then keep your hands open and at your side with your shoulders rolled back. Hands tell alot to sighted people because they do so much. You use your hands with almost any activity you do. If you hide your hands a lot then people think you're hiding yourself. And if you talk with your hands all the time you can come off as energetic and pushy.
* Clothing. Make sure you're wearing clothing that best fits your body. I love baggy clothes but they don't look great when you wanna instill confidence because it looks like you're hiding in your clothes.
* (I hate acknowledging it but) Smile more. Smiling makes you look more relaxed and approachable. If someone is frowning and eyebrows knitted together in panic many would leave them alone because they appear timid.
* If you wanna fix your walking gait I would start with not looking down as you walk (ask friends if you don't know). And then trying to walk making a point to face your feet forward and parallel to each other. Honestly? I tried to not walk like a duck with my feet pointed outward but I just don't care enough. You should walk with pride and purpose but you don't need to change everything. A ton of blind people walk with feet turned outward according to my old O&M.
* When you walk try to keep your stomach/core tight and close to your body and walk as fast as you do naturally. Royalty often walk slowly because they are commanding a presence and want others to look at them. As a blind cane user, you already get enough people watching you. Most of the confidence keys are in shoulders, head tilted up to 'face' others, and a solid center of gravity.

Other tips:
* When you bump into things or knock over something, laugh it off. "Hey I can't show off all the time. Gotta keep y'all on your toes." "Hey look what I found." "Remind me to apologize to the staff will ya?" "You just let me walking into that? And they said I was the blind one." "I'm not cleaning that up, haha."
By laughing it off it tells people you are making a mistake but it's not the end of the world. And laughter is often a good way to show confidence. A lot of sighted people think that us hitting a wall is the end of the world, and it's not. As cane users we will have to bump into objects to know they are there. But to a sighted person they see it as we are gonna run into the objects and hurt ourselves or break it. So defuse that idea by having a sense of humor.
* Make sighted guide into a polite/romance jesture. Say you need to find your dinner table. "M'lady, would you give me the honor of walking with me?" And then hold out your elbow to them. This is a cue that tells them to hold onto your arm and that they can lead you. It's a tad old fashioned but it also is classic. It's also efficient. A sighted person can lead you exactly where you need to be quickly. I take advantage of sighted guide a ton.
* Start the discussion yourself. If you're on a date or in the office with new people that don't understand blindness then bring it up first yourself. "now, I know you must be curious why I was giving the potted plant a hug earlier. Well you see, my vision is blah blah blah." It's another ice breaker and by starting the conversation first you can diffuse that tension at the beginning.

If you are walking at a quicker pace and you do slip or clip a wall or something and someone sees it's still ok. "man did you hurt yourself walking into that sign?" "Maybe a little. But I looked really confident doing it though right?" And you can laugh it off.

If you're on the committee, they won't have much choice but to take you seriously, no matter how many things you walk into. The line you're looking for is "who left that there?"

Still yes I totally get it. I am what you'd politely call a petite woman and I have for my whole life looked younger than I am. Now I'm not actually young anymore that's great, but add some sort of fairly visible disability and it's very easy to end up being treated like a schoolkid.

In a way this is partly what I was thinking of when I posted the "looking good" thread. In the end all you can do is be in shape, turn up looking tidy, stand up straight and speak clearly. I try not to be over formal in my speech, I curse and swear more than I probably should in casual situations because it feels like the sort of thing people wouldn't expect me to do. People might expect me to be meek and mild and I don't want to overreact to that but... you know.

There is a really fine line to draw between looking confident and just being overbearing and loud. I do not want to be the stroppy cripple. Nor do I want to be overlooked or patronised. It's a hell of a balancing act and if you find an easy way to get this right every time, please tell me. And if it helps, that's not even specifically to do with being blind. I was sighted, it's a balancing act no matter what. That's just life.

Well may be slightly not what you’re looking for I look confident except sometimes online. Mostly learning. I need certainty or I don’t understand and not sure if I do. Sometimes learning independently as a hobby online. I’ll ask a lot of questions. Just how I go about it. It’s not a blind thing but when it gets out I am blind, usually I don’t find it necessary to say it and mostly a few certain groups. They treat me differently because they say you don’t know why she doesn’t understand. Maybe she has other disabilities trying to be all pc. Trying to feel sorry for me.

No it’s not blindness or any disability it’s just self-confidence and being able to move forward.

You might still be able to work on your gait, etc., though it's obviously quite difficult. I do know fully blind people who have a weirdly confident walk, it's not impossible. I'm about the same level of vision as you (though I've noticed small things can make a big difference there so it's kind of dumb to compare) and I have developed a defensive walk that actually looks kind of weirdly confident, almost overcompensating in the other direction. I take big steps but also kind of make sure both feet are always planted like in boxing or martial arts (that makes it sound cooler than it is). When I go down stairs, I aim to put my foot such that I can feel the edge of the step with the front of my foot, which both allows me to adjust and also I can tell when the stairs has ended. Though I haven't been that good about it lately, I also work out a good amount and so I'm not really afraid of getting a few bangs and bumps as I can usually just take it. Also moving fast I've built up decent reactions, I probably look pretty weird sometimes almost walking into people and then doing a fast pivot around them but it gets me places fast and it probably does look confident.

I do sometimes feel the gears grinding, like my body telling me "this area is a bit hard to parse visually and could be dangerous," and I often make a deliberate choice to lean in. Often hesitance doesn't really save you anyway, kind of almost better (or not worse) to faceplant confidently, at least if you get lucky you're moving fast and looking good.

Anyway, weird post, sorry if it's not that helpful, and I still do have useful peripheral vision even if no central vision, so milage varies a lot. Maybe you should consider doing some martial arts like brazillian ju jutsu or if you can find a patient trainer, boxing or kung fu, lift some weights which can help with posture and confidence. If you're not that healthy maybe try yoga and tai chi. You can also work with an actor or coach if you have the cash to spare.