I do a similar thing... but I pick my nails. I have the shortest nails of anyone I know. Like you, I often pick them until they blled and I pick the skin around them too. I've done it for as long as I can remember and I have never been able to stop it for more than a month. I don't know if it is related to anxiety or not. My aunt does it though, though nowhere near as bad as me, and I blame it on her that I started it, lol. I don't know if that's the case though. She has anxiety and that is maybe why she does it, but for me, I'm not sure if it is anything more than a learned habit.