To leave a note on the door of my student flat asking my flatmates to keep their voices down when they come in

[unhappystudent]

...because it will be after 3am when they do and I'm sick of being kept awake all night because I refuse to conform to clubbing and drinking just because 'that's what students do'? It would be polite.

Sorry for using this website, my mum isn't around to phone tonight and I wanted some advice.

(I don't mean literally move in with a sleeping bag, though I that might be a tempting idea).

You're in the wrong flat share...

On Sunday pack your stuff up in your room, don't tell the buggers in the flat. On Monday go into your university's housing office, student union, personal tutor's office, administrator... Anyone you feel comfortable talking to. You are living in an abusive situation and they MUST find you alternative accommodation, perhaps in pg hall. This is not normal student behaviour, the noisy thoughtless stuff yes, the kitchen cupboard stuff is a massive red flag. When you've packed today go out, see the Lego movie or something equally fun. Then on Monday you are going to get this sorted. I work at a uni and if any student came to me describing this situation I would be on phone pronto pronto. It's going to get better OP

You poor thing

Thoughtlessness = normal (unfortunately)
Malice and bullying = not normal