help, do i have this problem?

I have been picking the inside of my lips since I was a little and now I have started on the out side. my lips are in a bad state. I also like to pick my scabs and eat them? and over that past year I have started to pick my head and the skin next to my nails... but the weird thing is I like to eat the skin I pick... I thought I was normal till one of my mates saw me and was freaked out by it. I was not sure If I have this because I find it hard to think I would have a problem like this.... can some one tell me ???