I don't have any friends. Help?

[StAyStRoNgDeMi♥♥]

I'm 15 years old my name is Ashley. I have friends but I don't have a best friend where I can hang around with and tell secrets to. The only time I talk to those friends are in class. And when I see them in the halls we're like hi, bye friends. It seems like I'm the only one that doesn't have any friends. Everyone has their circle of friends I don't see anyone alone. At lunch I'm usually in the bathroom listening to music and looking at myself in the mirror. People call me a loner. I feel like if I had one best friend I wouldn't need anyone else. I'm so lonely I need help. what should I do?