being the banker

Okay things are getting ridiculous now, not only do my housemates steal my food, leave the house in such a state that everytime someone comes round they say "have you been robbed?" and have sex on the stairs right outside my door, they now are leaving me the task of paying the bills. That's okay every once in a while someone has to charge their own account with something but this is the second bill I've had to pay for and now I'm having to chase them up every day for the money! They claim they don't have any and yet they somehow find the funds to go out getting rat arsed every night!!!! I really wish I wasn't living with them next year!