Everyone wants to kick my *** please help?

a bunch of people that i used to be friends with in my school had a party at a public park last night so naturally the cops came and everybody got fined. now im getting phone calls and messages on facebook and IMs threatening me telling me that know one wants to hear from me again and people even told met that if i go to my friends birthday party today that i will get my *** kicked. so ive decided not to go. but I didn't call the cops and everyone is convinced I did only because I really hate one girl who was there and she is the one who is spreading that I called the cops