Stay away from drug orientated people and parties. You do not need those kind of "friends". Emptiness will come with change as you change, only to be filled in with a stronger sense of self as you heal. You are in the process of healing still. In your case, you do not need to be surrounded by a circle of "friends". Learn about yourself as you heal, you seem to be a strong hearted warrior when it comes to your determination to heal. A counselor is a good idea while you are at school.