chronic onychophagia

I bite my nails as well. I've been at it since I was five and and I'm 13. People at school always don't want to hold my hand in a gym excercise, and I'm not nervous. My dad even said that it means I'm mentally ill! The only thing that stops it is chewing large ammounts of gum and clear nail polish( until I pick it off). I can't use nail polish in school and I can't chew gum, what do I do to help during the most stressful time of my life with High School Entrance Exams!?

What do you put on those fingers that do not have nails? a bandaid? or ? I put a fake nail but sometimes it doesn't stay on more than a few days. I'm putting glue on the puffy center part of the area that used to have a nail but it now only red and puffy.
I am so happy to have found this site. I was looking for something to put on my finger that might help grow a new nail; but, I do not think that is possible because there is nothing of a nail for anything to grow.
So, what do you put on those fingers without nails?