Suggestions?

So today I went to my gf’s party for her birthday. Her bestfriend was there, & her bestfriends girlfriend, & there friend. & some family, & I felt bad because I was upset & mad throughout the party because well I’m not sure. Different reasons, but they were sorta joking about rape & I’ve gone through alotttt of sexual abuse. And a couple weeks ago I was stupid & got in trouble for trespassing. Apparently this place that was put out of business is private property and blah whole story there but the cops came & guns were pointed at me & the other people there so my gf was talking about a gun situation and it reminded me of a couple of weeks ago.. & basically people were bringing up stuff that bothered me because of some of the stuff being a trigger but a lot of the people there wasn’t really friends with. I knew them but I’m not friends so I was wondering what I should do or how I can handle things like that if I go through a similar situation in the future.

Sorry for typing alot...