finger picker but likes the feeling

I'm a picker - zits, lips, nose, and fingers and toes. My fingers are the worst because it's so easy to do. I pick and bite my nails til they bleed and sometimes get infected. It feels good when I do it and it feels good afterwards when I press on the nails. Does anyone else relate to this good feeling? I keep a mental count of how many nails are painful (1 point for the right side of the nail, 1 for the left side of the nail) and am happy when there are more than 10. I mentioned this to my shrink and he said it sounded like a cutter. I don't know anyone who cuts, but from what I've read, it's eerily similar.