There are a couple of really big scars on my arm. They're the only ones that are visible, though: were the cuts I made as a teenager visible (over 10 years ago now), my arm would be a veritable latticework.
All I can do is really say why I cut at the time: it was a focus, and it helped quantify emotions. I often cut when life hurt, but I was unable to really express how it hurt. I've always had a hard time crying. When I cut, I'd cry, because of the physical pain, but I was crying because of the emotions I was feeling. It's just that when I felt purely emotions, I was never able to express them. Not in my face, my language, nothing. But I needed to get that out. Adding in a physically painful focus means I could cry, express in an emotional way what I was emotionally feeling, something that otherwise my body and entire being had a block on. It was just a way to make that feeling real in a tangible way. FWIW, I hear that those with Asperger's often use music or other sensory stimuli to express emotions they cannot otherwise deal with, and "let them out" so they can deal with them. That's certainly how I'd characterize my cutting.
I'd ask myself what major emotional events I was going through, what I couldn't find another way of dealing with that was somehow being expressed through my cutting. Look at the cutting as a window to other problems, not an issue in and of itself. FWIW, I don't think of my cutting as a negative. It helped me through something that I'd have otherwise not been able to cope with. Had I not had that focus, I don't know what else I'd have done, but I doubt it would have been pretty. Don't try to judge what you're doing as a negative. Analyze it to understand it, sure, but don't be judgmental. You may be able to learn something about yourself, and condemning your behavior makes it hard to understand it, because you start out with a negative spin.
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"You're never more alone than when you're alone in a crowd"
-Captain Sheridan, Babylon 5
Music of the Moment: Radiohead - In Rainbows