Friends trouble and school?

I fell out with my bestfriend and now I feel like everyone hates me, like she has turned everyone against me. I feel now I have no place in my group of friends. I hide away up in my art clroom at lunch times and finish off work because I dont want to sit at my table of friends. They don't talk to me anymore like they used to, and the girl I fell out with keeps trying to make me jealous. I just don't know what to do! I dont like any of the other people in my year, so I cant really make new friends, and I can't go to art every lunchtime like a loser. I never even done anything wrong, she just over re-acted. Ive tried explaining, its no use. I have a friend out of school, but I rarely see her. Its just in school thats the trouble. At home I sit in my room and go onto Habbo Hotel because that is the only place I feel like I have real friends. Help me.