Maybe you just like the sight of blood? Ever try a red pen? Just so it looks like a blood line? But, it doesn't injure you? Or, take some red food-coloring/dye and drop it onto your skin. Almost the same thing, but without the risk of scars or the pain. And, you said you believe you didn't do it for the pain. But, I believe you do it because you like the sight of blood. Anyways, try what I suggested. Maybe that would work. And, you can always talk to me.
Just add me, and feel free to leave me a message, anytime.