I'd love to tell you what to do, besides do the best you can.
My work environment isn't that bad, but I do know I'm the most disliked of the bunch, because I can't stand these girls' ringleader (who isn't even supposed to be in our office!!!) and make it no secret. I'm not buddy-buddy with the chick, even though I'm polite. I won't be friends with them, since they are so fake and high school. They talk shit behind each other's back and are super sweet to each other's faces. Oh, and they also think it's acceptable to cheat on a final exam.
My best advice? Sit back, relax, and wait for it all to cave in on them. I predict that the girls in my office are going to fall apart on each other sometime this year. That much immaturity cannot allow for any kind of partnership to go on forever.