Tips on how to stop self mutilation?

hello. i have been cutting myself for going on five years now. through the years, i've learned everything about self mutilation there can possibly be to learn. 'cept, now, i think i want to stop. i tried last year, but i got to about 2 weeks and couldn't do it. i have extremely low self esteem, mostly because i'm very overweight, but i've been cutting a lot more recently, i'm thinking its because my mother threw me out, and because of that, had to start in a new school, and trust me its terrible. i just lose control. i get in these moods that i cant get out of for hours at a time, where im filled with anger and sadness, and my razor is the only thing that calms me down. i've tried dancing, working out, calling a friend, drawing, etc. i've heard of the hotline 1-800-DONT-CUT, but am afraid to call it because i'm not sure if it is anonymous. does anyone have any other possible solutions to stop my addiction? thank you.