Country boys often turn city boys. I assume you've told her that you would be just as happy in a big city, so long as you're with her; and I also assume that this hasn't satisfied her. I think that she may be afraid that your values, tastes, and interests may be too different.
Ask her to outline what exactly she thinks the problem is. Does she think that you wouldn't enjoy the same type of leisure pursuits that she does? She needs to specify just how and why she thinks you are incompatible. I would also use my compatibility test, version two, which will help guide your discussion.
If your tastes and interests are too different, the test will pick this up. You may be the kind of person who could be equally happy in the country or in the city. She doesn't have to be exactly like you. In other words, just because you like the country and she doesn't, doesn't mean that you can't work out as a couple.
If you are equally at home in a city, and enjoy city life, you should be fine. Take the test and let me know what you find out.