Assault?

I'm only 15, I got drunk for a New Years celebration, I went to lay down because I was feeling out of it and these 2 other guys (20+) came in bed with me and started smacking my ass, and feeling up on me, I was so out of it I felt numb and had no control of my body, they're my accuaintances and they were also drunk I don't really bring it up, and I get this really awkward feeling when I see them, but I don't think about it to much because I shouldn't have been drinking either way... So it's my fault to begin with. I haven't told anyone that I've felt very uncomfortable since then, especially because everybody just laughs that night off like it was just a bunch of stupid stuff that happened.