Depressed and suicidal?

Hey, im 14 and live in colorado. Thanks for reading, for the last 1.5 years I've wanted to kill myself. My wrists are scarred to oblivion. I'm trying to feel better, I went to the skatepark to feel better, but people have been making fun of me so I stopped going about two weeks ago, at school I have no friends and sit alone at lunch, yes, I've tried sitting at other tables, all that comes from that is more ridicule. Lately I can't sleep, no matter how hard I try I can't even relax. I've told my parents but they don't seem to care. If you have ever been the schools isolated loner, been ripped on, or know someone like me who is still alive can you please tell me how you survived.