How do I stop cutting myself?

I used to cut also. I hid it from everyone. Finally one day my friend grabbed my wrist really hard and because of fresh cuts I had kinda, screamed a little and freaked her out, she found out and flipped. After that I didn't want to because I relized it was making my friend worry about me so much. I was so addicted but I'd think "what would happen if I accidently cut too deep? too much? Would I die? If I died, what would happen to my friends and family? Would they be ok without me?" So I guess... that helped me but then after a few months of being clean I found this thing, the butterfly project, yah, sounds dumb but it helped... You take a pen, marker or something and draw a butterfly on your wrist and under it the name of someone you care about. If you scrub the butterfly away, you kill it, if you were to cut, that too kills it, you let it fade away.