I have dermatillomania, from my sensory defensiveness, so my face and body are constantly itchy and I must scratch them. I have a lot of scars on my face and chest from this. Oftentimes it's not even itchy or concious, I just find that my fingers are compelled to pick at any scabs or zits that form on my face. Also my lips, sometimes, if they're chapped or dry, and any dead skin. I don't want to do it, it's not done willingly, it just...happens.
I also consider myself an emotional masochist (though not the sexual kind). Oftentimes my brain forces me to think or imagine things that are painful for me, and I can't control it. I suffer a lot because of that, whenever I'm allowed to escape into my mind.
Like most other things, I wish I could control this. I wish I wouldn't disturb myself. But then again, maybe I'm kidding myself without realizing it, and really subconciously I only make myself wish these things to create the illusion that I can't control myself, and in doing so create even more internal suffering.
I don't know if the self-loathing I sometimes go through has anything to do with it, though probably. I also think I manipulate myself into feeling anguished because it's the only way those precious few happy moments will matter.
I've never burned myself or used a knife or razor, and I've never wanted to. I don't like the sight of blood, and I don't like feeling pain. I almost stabbed myself with a kitchen knife in 4th grade to kill myself, but my mom stopped me. I never had the desire to do it again, something I'm very thankful for.