Why do I feel so sad?

I think my marriage is in trouble and it makes me wonder what I was thinking in the first place when I got married. When he gets home he reads, or plays his video game or watches TV. He rarely bothers to interact with Seth except when he first gets home or on occasions that I am in the shower or decide to go to the store alone ( Even when THAT happens ,he suggests " why don't you take the boy?") I feel as if he wants no part of family life. I thought he was ready for this as I was. He NEVER feeds, bathes, or rocks the baby. He rarely plays with him or even changes him. It makes me so sad. I don't mind taking take of the baby alone but if I were to do that I would prefer not to work full time as well, you know? I also clean the house, do the laundry, make sure all the bills are paid. I feel like I do EVERYTHING around here, and he just wants to relax. I definitely don't want to have sex with hyim because at this point I feel NO respect for him so I certainly don't feel attracted to him, and I also feel like my body is gross anyway, but thats a whole different story. I should have held out for a guy that was a bit more together. David just won't grow up. What to do?