Yes self-harm can be VERY addictive, I've been dealing with my self-harm addiction for 8 years and while I am trying my best in therapy to get better, it is a difficult process but it does help. I think that it would be beneficial for you to see a therapist. Until then try some of the things on the alternatives thread, if you find that something on there doesn't work for you throw it out and try something else. Good luck. If you ever want to talk feel free to
PM me.