picking

ive been picking for like 11 years. i pick my nose , i picks scabs, loose bits of skin, blisters, i bite nails and skin around my nails. picked my face, inside of my ears til they bleed, bottem of my feet, my legs, my scalp. anything really. cant seem to stop. seems to make me feel better. my feet does get painful and bleeds almost everytime i end up thing huge chunks of skin coming off and i have to cut them off otherwise its painful to walk. i really should do something about it but i dont know what. does anyone have any advice?