Aldousage, I'm trying hard not to be offended, you seem to be saying that people who cut themselves are doing it to project some kind of image, that they are purely thinking about other people, doing it for other people's reaction.
In genuine self harm cases (which are most i would think) this is SO far wrong. And I know you say you are trying not to offend, but it is offensive. You seem to be ignoring the reasons within the person as to why they might harm themselves- Self hatred, severe depression, mania, etc etc. All genuine and debilitating experiences.
For myself, in reaction to a new medication, I was thrown into such a searing, black hatred of myself that I had to hurt this thing I so hated. It was a combination of the action of hurting this unbearably horrid thing (me), and feeling that electric pain. Cutting was just one way of harming myself, unfortunately it's the only one I can't hide/heal. Afterwards I covered up, and there's only one person who I've actually told.