I hate my fiance's house and his 'dream' in life is to live there his whole life. What to do?

My fiance's bought his childhood house from his Dad and has lived there his entire life. The house is on a busy street, is over 86 yrs old, it's is small, small kitchen and he shares a driveway with his neighbors. What's worse is we live together now. It doesn't feel like 'our' house because it really is 'his' house and I don't feel like I have much say in how to decorate or anything. I think what is bothering me most is that it doesn't feel like 'our' house and I don't want to feel like a 'guest' is someone else's house the rest of my life. Second thing bothering me is that I always dreamed of living on quiet road with lots of land and trees. We can buy a home like that for about same money this house is worth. I just feel like I am giving up a dream of mine. He has some complaints about the house him self. He hates the shared driveway and thinks the kitchen is too small. His dream was to rip off the back of the house and make it bigger and rip off front of house and make it bigger. That all takes money and let's face it, probably won't happen. The way I see it, we can buy a home with everything we both want for same amount of money as this house instead of spending thousands making this home the way he wants it to be(which probably will never happen anyway at least not for a long time). Do you think it is strange for a man to want to live in his childhood home for the rest of his life(thats his dream in life.)? How do we resolve this? (I also feel like buying a new home 'together' is symbolic of us starting our new life 'together' as one.)