What kind of experience is it to like biting your nails?

I like to do such things when I am particularly nervous. I know this is a very bad habit, and it is easy to be laughed at by peers. I can't help it I always feel nervous when I meet strangers, and I can't help biting my nails. I may think that biting my nails can relieve mental stress and tell others that I am fine. In fact, I'm not nervous at all, but my subconscious actions have exposed my inner fears.

Nail biting is very bald, especially ugly and still hurts. I really want to change my shortcomings, but it's not easy.