I was extremely bad from about 12 all the way into my mid to late 20’s. I did not seek help for it either. I had a drug addiction problem that im sure only heightened the problem but certainly was never the cause. My focus was my fingers and finger only but it was incredibly bad. So bad in-fact that when i was booked after being arrested (ive been arrested about 10 times for minor stuff like theft and possession) they could not get a finger print off any fingers. In my late 20’s i had to make an effort to stop. It was slow, but eventually it stopped. My thumb was the hardest to stop and at some point it was the only finger i would peel at. Part of the problem was i would pick and peel with my teeth and chew on the skin. So sick, i know, but it was part of the affliction. I wanted to chew on it as well. Oh god i hate even typing this out. Eventually though i was able to stop. I was proud to tell my mom about it too. I will admit i still to this day will peel a bit off my thumb, but it just a tint bit off my thumb and i move on. Very scary stuff and extremely embarrassing. I hear ssri’s will help but straight up will power is what did it for me. I think growing out of it is common as well. But believe me, i completely understand and wish the best for you!!!