Sex dreams

I'm a virgin at the age of almost 20, and for he last few weeks I've been having this vivid sex dreams that leave me......well horny. 
I can't really do anything like masterbate cause I'm in college with FOUR roommates, two I live in the same room with, and they're always here. 
Sex, sadly, is not an option cause there is no boyfriend, but the dreams are so real and I can't keep waking up like this 😂 
What do I do???