Urge is so strong I don't mind picking myself for hours. Crazy?

I am 26 and I don't remember when I started to pick but surely started with fingers when I was little. Compulsive scratching of my legs for over 10years on he same spots until bleed, cuticle picking and biting until bleed, scalp, surfaces of both feet, and pinky toes are hedius and started to pick the skin around and behind both pinky toes. Of course until they hurt and bleed. I think I do more when I am stressed out, but Honestly also to get attention sometimes! Not my feet but fingers and legs. I was able to control myself when I wanted "them" to look pretty for summer season but nothing else motivates me. I like the pain and usuall doesn't care abt the looks, though I don't like to show. Fix? I will soon want to.