I'm sorry you're going through this, and hope you find someone to talk to soon.

You would be very surprised how many people have NO friends!! It's much more common than you think, especially with the TV/pop culture that makes it appear like everyone is surrounded by dozens of people all the time. Don't assume everyone else has tons of friends because it just isn't true.

A lot of what you're probably going through is that you don't have a subculture you belong to at your school the way the other groups do. Keep your eyes open to how they interact and I'll bet you'll notice some of them that really aren't part of the clique.