Left Out! smirked by the popular girls in school

I think I do not belong in the world! I don’t know, maybe I just felt it but most of the times, I can notice it. Not that I am the REAl freak girl that has only one bestfriend, and is smirked by the popular girls in school. I hope so that my life is as simple as that. But no… I am a popular girl in school, the social butterfly. It seems like I am over-all. I can chat with the jocks, athletes, the smarties, the mean, the invisibles- almost everyone. I am also smart, and quite popular in school, and on an external view, I have many friends. But of course, one has their best friends and we are four in group. But it seems like I ws always left out in them. Like, they don’t like me at all, and I feel bad about it. Also in my family. I felt left out. What shall I do with this problem?