Is it normal to bite your nails at 18
i'm 18 years old and i've been biting my nails since i grew teeth. ive tried to let them grow out before, but the skin commonly covered by nail is so used to regular stimulation at this point that having them be covered by nail feels almost like having an itch you can't scratch. so, i always end up picking at things or putting things under my nails to satisfy the "itch," (its not really an itch, just a desire for sensation) but this usually ends up breaking the nails and im back to square one. is it normal?