Well, if not depressed, you certainly have issues that have to be taken care of. Are your parents aware? Are you in treatment? You would benefit from therapy greatly, I think. You should not be thinking about suicide at all at your age. Trust me, while it may seem like nothing to you and you think, "who would care anyway?" many many people are affected by this act (suicide). My sister killed herself in 2000 and I am still not over it. My best friend also killed herself last June, and sometimes I actually feel pain in my heart when I pass her house walking my dogs and they try to run up her steps to see her. Also, her family is devastated. You sound like a smart ,literate girl but I definitely think you have to talk to your parents and get a therapist with whom u feel comfortable. Do this as soon as you can, and keep me posted. Good luck to youi and God bless.
All the things you do are you trying to hurt yourself. Do you know why? Usually something happens in your life. I think your friends are really good to be worried about you. Good friends! Be a good friend back and talk to someone that can offer you support (teacher, counselor, dr., etc...). You have your whole life to do amazing things and you will! If you find out what is going on within yourself you may help others someday to help find their way also. This is your time to start to shine and become your own person and change the world. Shine bright!