I'm sorry.

Don't give up on everyone else because some people were young and stupid.

This is the good part about getting older, you have a chance to grow up and make better choices about a lot of things, including friends, and with hope, so do they. Letting go of past pain is hard sometimes, but when you do, you will have room again for good things and people to come into your life.
And puleeze! basing a friendship on your clothing size? Ridiculous mean girls.

You sound like a lovely and caring friend. Don't forget that! It is who you are and any new friends will be so happy you are in their life.

Wishing you all the best ~