I used to do self harm. It was mainly due to boredom. Eventually, I decided it was more fun to carve walls than my arms.
Several years ago my best friend at the time carved a massive MEL into his arm using a stanley knife because he was drunk and a little obsessed with me. It lasted for six months and he felt like such an idiot. I think the scars have completely gone now.
There are people in this world who don't cut for attention, they cut because they are miserable and its their only form of release. I guess everyone has a crutch at some time or another. But cutting yourself too deep is just foolish. You could have a nasty infection.
*motherly scolding over*