Is this weird ?????????

so I just came back from this school trip from a place called Muskoka. So anyway I'm a 9er and last night we had a dance. And well everyone (or nearly everyone) was "grinding" and this random girl came up to me and grabbed my "backside" and started. I looked back in shock and all I heard was, " Oops wrong guy" and she walked away. So my question was Is it weird that I don't feel comfortable grinding, and I mean everyone was doing it but I felt weird, and I saw the side of girls I knew that I've never seen before. So is it weird that I don't want to grind or call girls "grenades" or "land mines" I seem to be the only one who isn't into that. And also sooooo many people were kissing and making out, it was just sooo weird. I haven't had a dance since elemantry school (ours goes up to grade 8). I just feel out of place is this normal?