I'm sorry to say that I agree with the posters that have advised you to either get couples therapy or end the relationship. If you're satisfied with the way things are at this time, then go for it, but you don't sound happy with the current arrangement. If she's not willing to negotiate or budge, then that should be a significant warning sign for you (and her). Once you're married, all you have will be 50% hers, making things very complicated should you decide to divorce in the future.
I wish someone would have stepped in and given this to me before I married. Now, 15 years later, we both realize that we really had very little in common and she (and I) have not been able to negotiate solutions to our differences. We did go to couples therapy on two occasions (several sessions each time) and while it initially smoothed things over for a while, it couldn't repair some fundamental issues in the relationship that were there from the beginning. Best wishes for making a decision you are at peace with.