I used to. For almost 6 years I mutilated myself.
Mine started after a very traumatic family death. I had never experienced something so devastating, I didn't know how else to react. It's just a coping mechanism and sometimes an addiction, like drugs or drinking. It's a very sad and dangerous thing, but it is not always just an attention stunt. Most times it is linked with depression and anxiety. That's when I would self-harm, in anxiety attacks. I would lose control of my body and mind it seemed, and that was a way to bring me back.
My problem went undetected for the 6 years, until finally someone very close to me found out and I had the courage to get help. Counseling, medication and a horrid week in a psych ward finally got me on the right track.
Haven't done it in over a year now, very proud of myself for deciding to save my life.
(Silly but, if anyone on here reads this, or any of these posts and decides they need help, I'm sure anyone of us Escapists would be here for you. Myself included.)