How can I stop self-harming?

I've been self harming for more than two years now but i really want to stop. I have been getting better the last year. I used to cut every day. Recently I didn't cut for two whole weeks but then something always happens to tip me over the edge again. It's just this last little hurdle I can't get over. I've tried talking to my friends and they just make me feel worse and say that i'm just stupid and exaggerating everything. My family don't know so anything like going to counsellor or something is out of the question. I want a way i can deal with it by myself. I really want to stop but I need some help. Please!