Lonely at University

I am a sophomore this year. It is the first week back, and there are so many parties and social events going on, and I do not have anyone to go with. I don't even know where most of them are. Last year i had a group of girls that i would go out with. Now we aren't friends anymore, so I am sitting in my room on a Friday night after going to one organization event for. Really wishing I new more people who liked to go parties, because I want to go out more this semester. Anyone sympathize?