Hi I'm a picker and my will power is not strong to stop on my own

Hi I'm 26 and I don't really know when I actually began picking I just know it started about 3 years ago when I started dialysis. I'm so ashamed and angry at myself for allowing this to take me over. I've been through so much medical wise that I'm tired and don't want to take anything else on. I hate that I've mutilated myself so bad that all I wear are long sleeves. I want to see a doctor but I'm really embarrassed. I'm glad I'm not alone in this but I feel so foolish when people ask what happened and why I pick....