How am I suppose to handle it?

I went to a party with some coworkers we were 10 it was suppose to be only coworkers but during the party one of my colleagues cousin came and he was the only stranger I just remember taking one drink then next moment he was on me in a room and I was telling him no stop don't touch me then a friend (she was dating the stranger cousin) open the door and I rush out telling her what he did and ask him to leave cause of what he did which she did he left , later on I close myself alone in a room cause I was still shock about what happen then all my Co workers entered the room and the girl start screaming and making a scene telling me that I was a whore that he didn't do anything that I was too young to know what's sexual assault and she kept on insulting me and everyone just stood here saying nothing after she was done they just left and u left the party eventually I was traumatized about what happen and i was scared of police not believing me so I haven't report it now at work they act as if nothing happened but I cut everyone off and all of those people left work one by one within one month so I left after them cause I really needed the work after a couple of month 5 month to he exact I saw the dude in supermarket with my mom and he said I should apologize for ruining his reputation that I was a slut that sleep with everyone keep in mind before that party i never meet him nor talk to him he was a complete stranger my mom defended me so he kinda run away now am scared to walk alone and going out to the mall alone or anywhere
How am I suppose to handle it?
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