People say i am REALLY skinny what do i do?

Well how tall are you? It really depends. I weigh 97 and am a size 14 but im really tall for my age. You probably have a fast metabolism, from your parents.You dont HAVE to do anything, you cant gain a lot more weight from muscle because you already have a lot of muscles, so try drinking milk, or eating nuts or peanut er as a snack and eating more protien. Youll gain weight as you grow, but for now dont worry about it! Good luck!