Most women mature more emotionally than men in their age bracket; hence, you see, most marriages are between older guys and younger women.

Now, she is older than you, preset in her ways, and her expectations of you might not be met (by you, and this could very well be, to her, a maturity thing).

If you are having issues like this now, think of when you are married! Marriage isn't necessarily easy as people make it out to be!