well you can't sell a house that's not in your name.. basically it's their house.. you fiancé need to be more rational imo and not pressure you to do things you aren't able to.. are you sure he's not trying to take advantage of you? is it his idea to "sell your house"?

Decide what you want to do. Then figure out a way to make it happen. Be creative and come up with something. Focus on what you can do for yourself rather than just reacting to other people and what they say or do.