Every state has their own set of requirements for graduation and most require at least one credit for physical education.  If your state has this requirement you are likely to have to pass this course.

If physical education is an issue for you, perhaps you could talk to your guidance counselor for possible options.  The counselor can hopefully help you over this hurdle.  

Get with your guidance counselor- this is likely the best way of communicating the issues you face.

Good luck!