At the end of the day you really don't know whats going on in other peoples lives. Most people aren't so open about their feelings, whilst others are so open that they exaggerate for attention (not saying either of these are you just saying the two ends of the spectrum). Having a bad mental health isn't a trend, but mental health awareness is. I think you might be confusing a bad mental health being a trend with people being competitive over who's got it worse. I don't know why its a thing, but almost everyone does it, its like its innate in group discussions, certain types of people will always have it out - and thats when the exaggerations start. Then again, if you are now at a special school that caters to your needs, everyone else will be there for the same reasons. Some will have it worse than you, and thats a bad thing for them but not for you. Do make sure however that you're only surrounding yourself with supportive friends (-and that you support them when they need it too!). Cut out toxic people man they're a waste of your precious time and they don't deserve you.
Have you spoken to your parents about the job situation? You shouldn't be looking for employment if you're not in the mental space to actually go to work - partly because its not fair on you but is equally not fair on your employer, colleagues or customers.
I don't think anyone thinks bad mental health is quirky. I know people who were sex trafficked as children, physically abused by alcoholic parents, kicked out of their houses and sleeping rough on the streets, the list is disgustingly endless. But if you met any of these people wou wouldn't know. I'm not saying its a bad thing to talk about your mental health, but it is a bad thing to talk about your mental health and assume that you're in the bottom 1%, especially if you live in a priviledged country with lots of mental health support and awareness. You have to be socially aware.
I'm no psychologist, but I think it just sounds like you just need to take back control. You're letting your diagnosis get in the way of who you really want to be! You can do anything you want in this life, you only get 1, so live it how you want to live it! Some people are just natural introverts and find a quiet night in better than a wild night out and thats absolutely fine! It just takes lots of time when you're in a mental state like yours, to get where you want to be, but its never impossible 🙂