You married the wrong woman? Sorry but that is a cop out!! I'm like Chrissy, I had to read your post twice to digest what you were saying. Listen, we teach people how to treat us. This woman/child you are married to would not be treating you with such hostility if she had been taught that she couldn't get a way with it.
From where I'm sitting I'm thinking it's your wife who married the wrong man. Ummm, some people need external influences when it comes to their behavior. They aren't able to police themselve internally and, until someone is willing to step up to the plate and externally say, "cut the bullshit out," then nothing is going to change.
Here is a suggestion, it's basically the same one Chrissy made. Tell her that if she wants a walk in closet and a bigger house to get herself a job and contribute to it. Tell her you were not put on earth to make her happy and you are tired of her thinking that's your job. Tell her you are sick and tired of her showoing disrespect for you and your children by throwing her childish tantrums and you are tired of the message it sends them about marriage and what marriage should be. Tell her it's her job to set an example for her children and that in the future you expect her to be mature enough to understand that means growing up and leaving the tantrums to the two year olds.
Put that woman you are married to in a relationship with the right man adn she would be eating out of the palm of his hand....it's about showing confidence and self-respect and setting some boundaries. Cathy