You would never make it so buy an RV !
You can make it, forget what Capt13 said. Your 3 land based needs can easily be met. Go to a boat show and look some boats to get an idea of what you are getting yourself into. Like living on land, there is no perfect home(or boat) so compromises will have to be made.
I lived on a 1981 C&C 36 during the summers on Lake Superior. My GF and here little dog would spend a lot of time there and there was always plenty of room. The biggest issues you are going to have is interior moisture and what personal items you need on board and which ones you want on board. Go for it. If you don't like it sell the boat and go back to the land.