A clique is just a group of people who hang together- it's not always 'mean popular girls who never let anyone else in'. You have your circle of friends and that's your clique. See, the word isn't negative. It's really just a group of good friends. ;]
I think the cliques that say, oh, well you can't sit with us because you have sweats on today. Or, we told you to wear this ribbon and well, you didn't. is just rediculous. It's sad but there really are girls out there like that.
It's okay to have a clique- we all have them, face it. BUT, you just have to make sure that the clique is healthy and your friends support you and don't pull you down instead.