@mikebb,
I would be more concerned about her comments about having never been a sexual person and sex isn't important for her.
If you consider yourself a sexual person and sex is important to you, then take her at her word. You have a compatibility problem.
It's rare for the frequency of sex to increase as two people age together in a relationship.
All sorts of things work for and against relationships, and the notion that if you truly care for someone any and all extraneous difficulties can be overcome is romantic but unrealistic.
If you and your girlfriend are compatible on some levels doesn't mean you should ignore those levels on which you are not. There isn't any reason to believe that you will not meet someone with whom you can enjoy the same levels of compatibility...plus sex.
Based on what little information you've provided, it doesn't appear that you've made a commitment to her. If there is anything to be gained by "modern" relationships, surely it is the luxury of time in which to determine the degree of compatibility before a commitment is made.