First of all, you don't need to be . You were outnumbered, and they kicked you down. Had you resisted, you might very well be dead or in a hospital instead of posting. Tell your parents and the police. If you got a good look at the guys and their car, chances are they will be caught if you give the cops accurate descriptions.
You've had a horrible experience. If you need someone to talk to about it, talk to a friend or family member. Feel free to send me a pm if you'd like. Do something to relax yourself. Curl up with a good book in a hot bath or play a favorite game.
In the future, you may want to carry a whistle with you. When I was in college, all freshmen were given a whistle to blow should a situation like yours had ever arisen. Pepper spray I've never used, but you might consider that as well. Imagine how those two thugs would have felt with an eyeful of that stuff.