what should i do about my bf and his friends?

my boyfriend and i have been dating for close to a year and a half and i’ve only met his friends once. his only friends are these three, GORGEOUS women who im very intimidated by. because my bf and his friends are a year older than me, they all went on a school trip to europe last year with their class and i could not go, but while i was sad i couldnt go i tried my best to not be bothersome and let him enjoy his trip. anyways, after they graduated they stopped hanging out for a while but then a couple weeks ago decided that they were all going on a 3 day trip to the beach without me. only one of these ladies has a boyfriend and she is known to cheat on him. i trust my boyfriend very well but i was very iffy about this trip for obvious reasons. as far as ive been told, nothing happened while they were away but they all have a tendency to get blackout drunk when they’re hanging out. on the one hand, im jealous because i wish that my man wanted to go on trips with me instead of friends that i feel are prettier than me. but on the other hand, i have been wanting more female friends lately after falling out with friends i thought were lifelong, so i’ve also been considering trying to hang out with them myself to see if i could be accepted into the friend group. so my question is, should i talk to them and if so, what should i say? would it be weird to basically steal my boyfriends friends instead of getting my own? sorry this got so lengthy!!! like i said, i dont have any female friends to vent to! thank you to anyone who replies <3