What's wrong is that you are a normal youngster caught in the middle of seperated parents who don't understand how it is affecting you. You need someone to talk to about your feelings. You could see a school guidance counselor or a minister in a church. In some cities, their are organizations where you can talk to someone.
Your problem is common to many thousands of youngsters. You are definitely not only.
Something else that will help you is participate in some kind of physical discipline. You could be on a softball team or take a martial arts class. Anything that helps you feel like you are in control of your body and mind will make you feel a whole lot better.
If you find it difficult to tell your parents how you feel, print out your statement and the responses you get and show it to them. Good Luck!