I'm being excluded purposely, is that bullying?

People have every right to choose their friends, so no, excluding you is NOT bullying. There's no way that every person in your school is part of the same clique, so you need to find and befriend these OTHER girls. And this time, don't make the mistake you made before. You seem to have an anger management issue, and if you don't get it controlled, you'll probably wind up losing your future friends too.