Question about using fiancée's income when buying a home

You may not have many expenses not since you live with your folks and all. But once you get a house and get married they start adding up quick. What you think I extra money will be gone. Especially if you have kids anytime soon. Even if you don't that mortgage will be the same in 5-10 years. Don't think once you get into that house your wife is going to be happy with all the old crap you had in your apartments either. She going to want new curtains and furniture and everything else. It's expensive. I speak from experience. I wish everyday I would have just paid off my loans and lived more poor a couple more years because now that I've got kids and a house it definitely not gonna happen. Not that I can't afford them, but it would be a nice chunk of extra money. Wish the MT board was around when I was ur age. I've made it through ok but learned a lot in the process that would've changed what I did if I'd have known then.