I want out!!

My husband is a controlling person and I don’t know how to get out of this marriage!! We have been together 18 years we are in our 30’s and the last 5 years have been the worst years ever!! I’m forced into sex when he’s drunk on his ass and is they only time he’s wanting to have sex and tonight in order for me to do what I’ve had planned for weeks he made me do sexual favors to please him cuz what I’m doing tomorrow isn’t benefited him at all, so he’s been drinking since 5 and is 11:30pm he came into the bedroom where I was already laying down cuz I’m tired as hell and he lays down and said well you better get pleasing me in order do what you want tomorrow and at first I thought bee was joking and I laughed a little but then he got very into and post at me and when I asked what wrong he stayed to get pissy and tell me that unless I please him I’m not leave to go anywhere tomorrow and that he will take the keys so I can’t go.

Talked with him how I feel with how’s he’s been treating me but he don’t care at all.