Does highschool shape the rest of your life, I'm going through hell?

I absoloutley love who i am but when people judge me and call me things... i fall back on my self confidence and choose to believe them and alter my behaviour to make them happy. ITs not right .. there not worth it ! i become something i'm not to please. I dont know how to be myself without caring what the hell every person in my grade thinks ! i want to become transformed this summer.. help pleaaaaase