help beating picking for my wife

I am 23 years old and have bit my cuticles, fingers and inside my cheek for as long as I can remember. I don't know why I do it but I have decided that I am not going to do it anymore. I'm a Marine and just returned home from deployment. I come home and my wife is perfect and everything should be perfect but there I am with nasty red and swollen fingers. I want to do this for her. I know she thinks it's disgusting. My plan is to use a liquid band-aid type product during the day to prevent biting and lotion at night. I’m open to any advice! I don’t talk about this with anyone because I’m so embarrassed, so it was nice to find people like myself where I could remain anonymous. I’d like to know any techniques people have used that have helped.. or hurt. I believe I can beat this, I just need to know how.