How can I get the people at my school to leave me alone about my uality and self harm problem?

I'm in the 8th grade, and I made the mistake a few months ago of telling one of my best friends everything. How I'm , I cut, I was d, I have an eating disorder, how I tried drugs once about a month ago, and how I drink more than she thinks. She said she was gonna be there for me, but what happened? She told the rest of my friends. Now they all hate me and are convinced that I'm "bad" and will get them in trouble. That's fine, they weren't real friends, etc. But they won't leave me alone about it. If I talk to someone else then one of them comes up to me and says "Did you tell them what your ex boyfriend did yet?" or if I'm eating during lunch they come over and act all shocked. One of them came to my house last night and I THINK they were trying to be nice. They said that she doesn't really think I'm bad but I should be really happy she's talking to me since I'm friendless. So I told her to please leave and she called me a druggie. Today, in health, one of my ex-friends came up to me and said "You're so frickin emo." and I said "Leave me alone." and he said "You STILL cut? Wow." I said "No, I stopped cutting." and he said "Then how did you get that cut on your face?" and I ALMOST said "Because my mom beat the crap out of me last night." but I know better than to tell them anything now. Then later at lunch he came up to me AGAIN and asked to see my wrists. This is getting realllllly annoying. How do I get it to stop?