Are you overweight or just bigger? Have you been to the doctor's recently? If so, was your weight mentioned as a concern at all? How tall are you and what do you weigh?
People come in all shapes and sizes, but if you know that you are actually overweight, you can ask your mom or dad to take you to the doctor's and talk about what can be done about it.
Do you eat healthy foods or mostly junk foods? Do you drink a lot of sodas and fruit drinks? Do you get regular exercise? Is there daily PE at your school? Do you participate in any sort of sports?
You can do a lot on your own if you know you could be making better choices with what you eat and drink, and how active you are. Talk with your parents and your doctor about where you might make some changes if necessary.
As Hansasa said, try not to let what others say bother you. It is not easy to do, and people can be hurtful, but try to focus more on what you can do to be as healthy as possible.
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