No matter who the abuser is, you must leave the relationship. I think you already know that. Tell the police, or go to a local women shelter. Friends and family, no matter what they say, they want to help you, but I'm not going to lie, some families don't understand the troubles you are going through so if that fails contact authorities, with no relation to your husband. No matter what your husband says he will not stop abusing you. Also, if you have children with your abuser, it is 60% likey that a young boy will grow up to become an abuser himself, and i think around 40-50% chance of a young girl to become abused. I know you wouldn't want that for your children so please try to leave, and no matter what this is not a normal relationship, and you can't do this alone, someone out there will help, friends family officers, or a complete stranger on the computer... wink wink.. lol.. GOOD LUCK be safe.
PS DON"T STOP TRYING TO LEAVE!! It will be hard, but in the long run you deserve better, and things will get better!!!