I can't stop!

Hello I have been picking at small pimples on my face, arms, legs, chest, back for quite some time and just can't break the habit. It is so bad that they turn into scabs and then I even continue to pick those off, causing ugly scars all over my body. Mosquito bites are a nightmare and I look at myself in photos and see my scar covered arms and it just disgusts me. Like the site says, I don't even know that I'm doing it most of the time. I'll be sitting in front of my computer working or watching TV and my fiance will have to point it out to me, and then I get upset about it. My parents ask about the scars and don't understand why they are there, and I don't know what to tell them or even how to begin to explain it. I've tried to break the habit but it seems when I least expect it I find myself back at it. :(