I need help, who can help me?

I'm the same age as you and I've been through a few of the same things. I never did anything extreme, but it was tough and degrading. I go to a K-8 school, so everybody there knows you and it's hard to meet someone new that you can hang out with. Hang in there, before you know it you'll be out of school, it'll be summer, and then you can meet new people that will accept you in high school. Keep your head held high and go to an adult that you can trust if you ever feel the need to cut or hurt yourself.