I'm feeling left out and overly bullied?

I was the new girl in school straight from Vegas and into hillbilly Reno. It took me three months to make 5 friends. These kids have known each other all their lives. I sit at the table and right in front of me they invite each other to sleepovers but never me. I'm not going to the same school as them and when I tried to give some advice to one of the friends she said "OUR school is different from YOURS" And kind of sneered at me. I can't even borrow a book from one of them because they say they don't trust me enough. I'VE KNOWN THEM SINCE LAST OCTOBER! I don't know why they treat me like this sometimes, Most of them love me and say i'm extremely funny. But this girl Krystal and her other friends always give me wierd looks and say that i'm trying to hard. My best friend Thomas is well known around the school, but I barely get any time with him, he always runs off to another group of people. And since i'm aparently 'Not cool' since I'm from Vegas I can't follow him to the other groups because they make fun of me and yell at me to go away. I was extremely popular in Vegas and I don't know why these Ignorant Redneck douchebags hate me. Ever since I came to school they've made fun of me. I know I'm attractive and my friends have complimented me on my looks as well. I have a nice personality and the only thing abnormal about me is my accent(British) and the fact that i'm a bookworm. I really don't know what to do