Kind of confused

I can’t stop thinking about something that happened to me when I was younger (I was around the age of 10 then I’m now 16). I am probably over reacting but it just keeps on coming into my head every now and then. When I was younger i used to do Surf Life Saving and would travel around the state for different competitions, this competition was the most important and was the final competition of the season. My family and I would camp with my sisters friends families and on the final night after the competition was finished the parents would all get together and have drinks. I remember I was in the caravan and was watching a movie, the movie finished and I was told to get ready for bed. I went outside to grab my shoes and when I bent down one of the dads squeezed my arse. I know that he was drunk and probably didn’t know what he was doing but I can’t stop thinking about how all of the other parents laughed when I flinched away. I went back to my tent and cried after that. My parents weren’t happy with him and now we don’t see him anymore because he divorced his wife then and now doesn’t see his family that much. This probably isn’t a big deal but I feel so gross and icky when I think of this. It just feels so much better now that I have told this to people.