I've worked at Amazon before (edit: here's my AMA about it). The worst part about it is peak, which they're towards the end of rn I believe, but peak is also when they hire, as they're often overstaffed the rest of the year. Personally, I would not be willing to do another peak, but I would consider going back if I could do part time, although I think that can be harder to get. Otherwise, if I could get on in the off season and quit before peak, that would work too and would be pretty funny. Tbf, you can make decent money because of the overtime pay (and not having time to spend it) but imo 60 hour weeks are not worth it, not unless you're desperate.

I will say that warehouse work seems like a good fit based on your priorities. Ime, warehouses are far enough removed from customers that they don't care about how you look, and also don't really expect you to pretend like you give a shit. Warehouses also tend to be pretty big, so you can avoid having too much contact with people (which is a pro and a con I guess). It's also not a bad way to get into shape, better to get exercise on the clock than pay for a gym imo. Oh but one major downside is that a lot of warehouses are particular about what goes in and out (and have metal detectors), so you may not be able to listen to music or have your phone on you.

Maybe skip Amazon but I'd take a look around and see if there's other stuff available.