Felling sad and alone?

I have been feeling sad and alone right now. I really can not take to my friends. They would tell everyone what I said. The whole school would know. I can only talk to one girl on myspace. She lives all the way in London. I live in New york. The bad part is I have been thinking about killing myself. I know I'm really young and things do get better. I love my friends and family to much to kill myself. Some times I want to make myself get hit by a car really bad. I was talking to a conuclar but I stopped. It was really not helping me. What should I do? I have started cutting again too. Please no rude answers. I really have no one to talk to. Only the girl in London.