Having trouble with piers at college and dont know what to do?

weve been back for a week and i knew this girl from a few year ago so we were kind of with each other a lot but now as the days goes on she doesnt want to be with me at all n i meen at all but i dont understand why?? i know im not a freak for abseloote certain i dress good i actually get alot of attention of boys but she seems to really not like me. i really dont want to go to college because i feel so awkward and i know other girls ok but not to go to dinner with and what about when i need a partner. awww honestly this is really upsetting me. im a year older and yess they are all really immature well some arent. but i actually know really cool girls in other cles who i can talk to because i know they actually really really like me becase ive known them for years and go out with them but i just dont get why this girl really dislikes me and trys to single me out and makes me feel crap and just leaves me when she knows i dont know any others well enough... i dont no what to dooo .. i want to make friends more with other people but if i do and they dont like me also then the girl will completely leave meee... reallly guys what should i do???????????????