I pick almost constantly

I pick on the bottoms of my feet, my cuticles, and my lips. As I'm sitting here, my thumbs are bleeding and my lips are raw. My husband is not home until later tonight so I'm sure I'll get at my feet when I get home from work. I quit smoking 3 packs of cigarettes a day for going on a year and 1/2 so I just can't understand why I can't quit this! I've been doing it for as long as I can remember. I get enjoyment out of it until the aftermath. Embarassingly enough, I even eat the skin which also brings enjoyment. I'm always saying I'm going to quit, lets start with this first (example:lips) and when I'm good with that go to the next thing. That never works. It's embarassing, my daughter is starting to do it to her lips (which is where I started), and I'm tired of it ruling my life