I can often pass as a regularly sighted person. And itʻs less of a good thing when youʻve adjusted automatically all your life and itʻs getting to be as funny as some of the relatives you knew as a kid. "Please always introduce yourself so iknow who you are"
Then other times people ask if Iʻve always been blind or how i manage my circadian rhythms.
I usually have the "selfiestick" with me, in purse. I got busted last weekend for not wearing it in the bright daylight.
Iʻve had a blind friend describe me what kind of car iʻd be expecting from Lyft. And so on.
Iʻve had some pretty rude reactions from sighted people when iʻve told i canʻt see or read something obvious to them.
"You donʻt look blind." Wtf is that supposed to mean? Oh sorry I missed the dresscode memo. With what Iʻm wearing I would not pass as a sighted person in Italy any more.
Iʻve started habitually showing my friends how to do stuff with a screenreader easily. If I show it first, as in itʻs cool and makes my life easier, then perhaps i avoid some of those "why do you use..? Oh" reactions.

Now that you mention people not believing you, that reminds me of a couple of incidents from years ago. Whenever I showed my work, such as my design portfolio or drawings, people would often say things like: "If you can do this, your eyesight can't be that bad". Now mind you, these were people who actually worked with visually impaired. And I'm legally blind. :P