For some context - this is my first semester in college where I'm having a roommate, and there have been several complications. It's off-campus housing and we don't attend the same university.
My roommate has lots of friends and is more or less a party animal (frequently arrives in the room later than 2 AM, has far more than the maximum allowance of alcohol in the refrigerator, etc.)
I can live with that despite not approving of it, but recently there have been more serious issues. For instance, she had her boyfriend stay in our room for several nights, and several times they'd bolt the room and I'd be unable to enter after coming back from the library/dining hall.
What prompted me to post here, though, is what happened after spring break. I'd gone home as usual, and my returning bus was quite late and I ended up arriving in the room at around 2:30 AM or so, only to find one of her friends sleeping in my bed.
I was at a loss of what to do in this situation, so I simply left and waited in the lounge until morning before entering (wasn’t able to catch much sleep, unfortunately). So far, I haven’t raised this issue with her, but I am wondering what the best way is to make it clear that the way she currently behaves with her guests in our room often makes me uncomfortable (without being confrontational). Thank you!