I assume you are concerned about getting undressed in your phys ed (physical education or gym class) and I can understand your reluctance. My son was the same way. Exercising is very important and you should take it with an instructor for best results. Exercising at home might be an option, but it is an option that usually is not carried out. Good intentions, but lack of motivation will do you no good and it will happen if you exercise at home. It won’t last long. I think you just need some encouragement in your abilities and getting your self-esteem grounded. And kids can be so cruel. I understand, I understand, I understand. But if you don’t step up to the plate and try for the home-run on your own, you will be sorry in the future. From my personal point of view, once you begin to stand up for yourself by yourself you will greatly improve your ability to face obstacles. Talk to the student counselor on your own. AND counselors are trained to be able to help you with problems. Don’t fear! Face! And I wish you all the luck in the world!