I'm sorry if the question is insensitive and it's my first time posting.
No need to apologize lol. I know that people tend to do it for different reasons, but my own personal habit started out of something kind of unusual. I used to do a lot of construction work when I was younger to help with family and friends, and lets just say I once had an accident that ended with me almost breaking my spine, but instead only heavily damaging my back muscles and ripped a lot of the skin off. While my back ended up feeling like shit for two months, I'd rarely feel the pain. I noticed that whenever I was able to find a comfortable position that relieved me of the pain from the bruising, the only pain I would feel was the light burning feel from the cuts. For some reason, that after-burn feel was somewhat relaxing/comforting to me. And while I didn't think too much about it at the time, about 6 months later after the accident, I ended up, honestly, out of boredom, cutting my leg with a boxcutter. By this time, I had completely recovered from the incident. However, when I cut myself for some reason, there was a kind of humor behind it. And after the cut clotting up, all I felt was that same pleasing burning sensation.
Before you ask, no, I wouldn't call it sexually pleasing, but more like the kind of pleasure you get from a good massage or after a workout. I know some people do it out of a kink thing, but it never got to that point for me. For a while after that, I'd begin cutting myself for a few months almost every day as if it was a personal reward for something. I'd almost always do it when I was in a good mood. But I'd make sure to do it in areas that no one would ever see. Like my inner bicep, inner calve, or thighs. Eventually, when the scar tissues started showing up more and more, I became a little unsettled by how far my habit had gone and tried quitting. But surprisingly, I realized that it wasn't too easy. As silly as it may sound to people who haven't experienced SH issues, the best I can describe it was that I had become addicted to it.
Eventually, the reason for SH would change for me. During times in which I was angry at myself for something like failing a test, not getting something done on time, or just remembering past mistakes that I hadn't forgiven myself for, I'd end up doing SH out of a sort of self-punishment. And eventually, it would get a bit worse with me feeling constantly guilty for things outside of my own control.
Did I hurt someone's feelings without realizing it 8 years ago who made it clear they just wanted to be my friend? That's 12 slices on the back of my thighs so that every time I sit down, I'll get a feeling for how much I hurt them. Remember that girl who made it obvious they had a crush on you, but you just brushed them off and ignored them because you didn't want to deal with them? Time for another 20 slices on the bottom of your feet, so you get to experience a bit of how much it pained them to walk to school only to see you.
It has gotten better currently. I haven't had any relapses in over 3 months, and before that, it was almost 8 months. It's a difficult thing to break out of, and after reading other people's experiences with it, It's honestly made me feel pretty lucky since, while my own cravings for SH tend to get in the way of things, for some people, it's a lot worse. One of the main tools I'd use to get out of it was a simple metal cilice. While it would hurt like a bitch it wouldn't cut into the skin or leave any real damage. I don't really use it that much anymore, but it's certainly a better way of treating SH cravings than just a blade.
Sorry if this was a long read. I meant to keep it short but ended up getting a bit carried away with the details.