Friend problems.. Again. PLEASE help...?

Okay. I have a group of 4 close friends. I have more, but we are kinda the main 4, you know? Well, We used to have this other girl in our group, lets say her name is Amy (after she left, a new girl kinda came in, so we have only had 4 at one time) Well, Amy used to be an average girl, but a little weird. she wore her brother shorts just LAST YEAR and had really long hair. she played basketball with the boys all the time. and no guy liked her. well, this year, she is one of those "popular girls" and she is friends with everyone a year ahead of her, not with us. she isnt mean, she is just really annoying and errogant about EVERYTHING. she thinks being gay is a choice and that gay people just want attention. well, i dont like her. at all. she is just annoying. one of us 4 recently starting hangin out with her recently. this girl, named... Lilly, is my oldest and CLOSEST friend. then another one, who said just a few weeks ago she feels the exact same way, started hanging out with Amy too! lets call her becky. I don't get it.. the last one, i havent talked to about it. she doesnt even pay attention to amy, so i cant talk to her about it. i thought i had becky to talk to, but she doesnt feel the same anymore... i have no one. this ALWAYS happens. i am the one in the group who sees past peoples lies and images, and i can see the real person. my friends cant. i have NO idea what to do. dont say "ignore it." i am one of those people who CANT. I get really angry, and i usually scream into my pillow after a while. this has happened before. i usually just wait for them to get over it, but im not so sure this time because Lilly said she is jealous of Amy; that she wishes she was her. i hate that.. what. do. i. do. I DONT want to lose my friends.. how can i learn to ignore it? because they post stuff on facebook about how much fun they have. please. help.