Cutting seems to be a popular hobby nowadays and mean people make fun of it because they can't empathize but it is a serious issue and a psychiatrist should be spoken to about it.
There were reports of young females whom would rip their hair out of their head because they were addicted to the sensation of the feeling it provided.
I think cutting happens to be a long those lines but it's obviously a very destructive passion especially considering that you're liable to get some pretty serious infections or accidentally cut too deep.
I would take it more to a pdoc or health forum, as you have here, but I wouldn't go sharing it in any other social gatherings or forums like Myspace because the ridicule of cold hearts will just make the situation worse.
Either way, I don't frown on you at all and can kinda understand what is going on but the simple insight of an electric banana isn't going to fix this issue but a good balance of meds should.