Do I have a picking disorder?

I am 12 and have been biting/picking my finger tips for as long as I can remember. Earlier a layer of my skin on my pointer peeled. I have other fingers with peeling skin and all of them have at least one crevice I've made. I fear this could be a disorder, for I do it quite often.I do this whenever I'm trying to focus, I'm nervous, I'm anxious, and when I'm bored. I need to know if I have a disorder, if my skin will heal, and how to recover. I feel alone and am scared to tell others.

Thanks

~me