I pick,chew,bite anything I can get my mouth/fingers on!

I have bitten my fingernails and the skin around it for as long as I can remember. As a child I was never encouraged to stop because my mom did it just as much as I did. I am now 20 and pick EVERYTHING. Most often I am eating the skin around my fingers, but I also compulsively pick my nose (and eat) and pick my scabs (and eat). I have read that these compulsions come from anxiety or depression...and while I know I get anxious often..I have no idea what I am anxious about. Seriously, no clue. This problem is starting to become embarrassing, I am constantly checking my nose for something to pick and when my boyfriend recently fell and got a few scabs on his face and hands I obsessed about picking them. All I could think about was picking the giant scab on his face, one morning he was picking at it and I had to leave the room because I was so anxious about wanting to pick it off. In addition to picking with my hands, I pick with nail clippers and cuticle cutters. i frequently cut my toenails too short and cut the skin off of the calloused part of my feet. Most of the time I have no pinkie nails left on both of my feet because I pick them so much. The ladies at the nail salon always ask me about it, I tell them that I can't help it...and most of the time I don't even realize what I'm doing. I'm not sure of the health risks associated with any of these things, I do have eczema which doesn't really help me kick the habit and I avoid putting on lotion. It is now becoming embarrassing, the kids I babysit ask me why I have so many boo-boo's and I always feel the need to escape to the bathroom to pick my nose or put a band-aid something I just made bleed all over the place. Truth be told, I don't know if I want to stop...mostly because I'm afraid of the psychological effects. I'm wondering if what I'm doing relates to my mother, she bit her nails, picks her nose (and still eats) and also picks her ear wax and eats it. All of this would sound so disgusting to the average person...which is why I have never been able to tell anyone but my boyfriend. He is still pretty grossed out about my compulsion to eat scabs, but at least he hasn't left me! I'm afraid that I will pass this on to my children...help.