my husband is a man child!!!

From coming home from work straight to playing videos games, to constantly relying on his mother or father. He never wants to have serious conversations about the future. I am the only who seems to be responsible for our daughter in his eyes.  I am lost, it's like the man that was at our wedding that I said I do to.. is gone..? What would you do? Talking does not work... I have tried so many times and he says all I'm doing is nagging when all I want to do is have a serious conversation. He's 24.