all they ever talk about is who's going out with who and waht to wear to go out and get drunk in at the weekend which i cant stand. im pretty sure they havent even noticed that im missing.
i do hang out with some people from lessons occaisionly as they talk about decent stuff.
i prefer to be alone even if its not the best thing for me cos thats when my depressive thoughts hit me hardest.
I spend time alone on purpose, too, just because I realize it serves me best. I truly believe I'm happier this way than forcing myself to build the friendships that are available to me. I'm happy socially, and I know as my situation changes in the future I'll be able to change to be happy socially there too. I'm okay because I understand myself, and it sounds like you understand yourself too.
When your depressive thoughts hit you, do you ever find ways out of them? Leaving yourself vulnerable to them is kind of scary, but sometimes it also allows you to work with your thoughts and feelings uninterrupted and gives you a better chance to deal with that depression. So you could take advantage of that, but I don't know how that would turn out. The depressive thoughts are something to be aware of, but if they don't get worse then I think it's fine to be alone for now.
Talk to a doctor before you spiral out of control.