I Need Help. Really.

I’ve never really seen the point of self harm, but a few days ago, I started biting my hand to take my mind off things. I could concentrate on the pain instead of worrying. It just occurred to me today that what I was doing was self harm. I never bite hard enough to draw blood, but hard enough to leave a red mark by the end of the day, and I can’t seem to stop. I know I should stop, but I don’t know how. I don’t want to be a burden on my friend anymore. He helped me when I was recovering from depression the first and second times around, and I don’t want to trouble him again. I don’t know who to go to because a few years ago, when I threatened to commit suicide, my parents told me to stop acting up for attention instead of getting me help. (To be fair, I was in fourth grade. But I meant it. This has repeated itself with different scenarios, all pleas for help.) I don’t think they’d believe me now. And I have no other friends I trust. I’m scared.