I don't self-injure so that my friends don't see, and so that it doesn't hurt my mother. I have a friend that wants me to stop self-injuring for myself.

Good reasons not to is that, as I've read on this thread before: It doesn't really solve the problem. It may seem to help the emotional pain, however when the distraction from the physical pain goes away, the emotional pain comes back because it was only ignored. Then the emotional pain is now added to depending on how the person feels afterwards about SI.