Hi there Julie,
I can agree that living in a dorm has been a very stressful experience. When you say that you didn't want to shower because someone was humming, was it because it was too loud, or was something about it irritating you? If so, I can attest to that---I am very sensitive to certain things, when I am depressed, I get extremely irritable--loud voices or people humming behind me piss me off...
The feeling empty despite being in a crowded room is also normal...I've been there many times.
Have you been seeking any sort of support at your school? I know that some schools have free or affordable counselling. I suggest that you try it out, because personally, I wish that I had used it more often when I was in school. Please try it if you haven't

And if you need to talk, you can message me.