Did I make a mistake?

I don't know if moving in together was such a good idea. Her mood changes are difficult to follow. Her constant intolerance and elitism are unbearable. I feel like a child living in that apartment. And then she asks me why I'm distant and not that excited. My reassurances are starting to feel hollow and not real. The smiling is getting tiring. I want to just tell her to grow up, but I'll make things worse.

I keep keeping my hopes up, and keeping the mood positive. Trying to make her believe we can make us work. We're not perfectly made for each other, and it'll take work, and that is okay. But after repeating that so many times its loosing its meaning.

Is this temporary? Is it the result of the incredibly stressful week we had, or did I make a mistake?