You are already the victim of domestic abuse. Just because he doesn't belt you around doesn't mean he isn't abusing you. Your staying in your room and only leaving it to "go to the kitchen or living room only when necessary" is a classic sign of abuse. He is also placing you at risk by enforcing his desire for drugs.

I would call the police telling them that there is an abuser who is a drug smoker and he refuses to leave your home and you want him out. Forget using him as a taxi driver there are community busses available that will take you where you want to go. Get rid of him and reclaim your life,

Rhiannon