Writing your two weeks notice as a letter explaining all the reasons for why you are leaving as professionally as possible and giving it to your manager would be the best way to go here in my opinion. You can’t help if other partners are going to talk smack/be upset but handling the situation with professionalism will, in the end, make you more mature than any of these people could wish to be.

I really doubt anyone cares as much as you think they do! But if they do fuck em. You gotta do what’s best for you!!

You can rest easy to know that you probably will never see those partners ever again so let them talk they don’t oh any of your bills lol. If you like your manager then a nice letter and also a sit down explaining your problems will ease the blow in my opinion. But you have one life to live!
Ps you could try going to a different store in the future if you still like Starbucks!

First off, I'm 17, almost 18 in a few weeks, and was in a similar predicament, where I didn't have to work.

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Starbucks was my first job, I got hired around June of 2019, and I left in June of this year.

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My trainer came from another store, and just like yours, threw me on the floor with no help. Then, rather than correcting me while on floor, they would discuss my mistakes with me in the backroom. Some were nice about it, others not so much. It took a solid month for me to open up to some of my coworkers. In particular, one SSV was so nasty (as a minor, every 4hrs you have to take a 30min break) I reminded the SSV about 15 minutes before the 4hr mark that I needed a break, and no sooner do I turn my back to go back onto DT, do they start mocking me to another coworker. One time during a lunch, I forgot to take my headset off, and I listened in to 3-4 of my coworkers making comments about how bad myself and one or two other new people were (this changed after being there for about a month and a half, but it still hurt nonetheless and felt like I couldn't trust anyone)..

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My manager was also not the best. They knew from school I couldn't work certain days/hours, and it was stated in my availability, yet I got scheduled for shifts within those hours anyways, and they told me "I'm busy, you can find coverage." After not showing up once and ignoring their calls for a day (after this had happened 7 times) they got the message and apologized profusely.

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Sorry if this seems long, but I had the same mental state as you, and I was MISERABLE. My family and friends even said they noticed a change in me - I just stopped caring, was constantly stressed, and just too tired to bother with anything. The day I left, I felt like a new person, and within two weeks, I was energized and ready to go. I'm a full time student as well, so it's a lot, and while I know this comes with any job, I now run my own business that I make far more than what I did with Starbucks, yet I am happy, free, and better than ever.

Anyways, if you feel chained or obligated to something or someone because you originally told them one thing and it doesn't work out, you can leave (give 2 weeks notice, and if you're asked to stay, say no, don't be guilted into it). Your #1 obligation right now should be your happiness, #2 school, and #3 anything else that follows. Starbucks shouldn't be in the top #100 obligations.

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Best of luck :)