Addicted to hurting myself! Help Me Please!?

Okay, so I'm addicted to hurting myself. I need help to stop, but I really don't want to stop. I don't really have a reason why I do it. I just do. The good thing is that I never actually cut myself. i usually just glide something sharp over my skin until my arm is full of welts. It's a bit cruel, but I just can't stop. What can I do????