I require some advice and guidance here Because I am to the point where I am just ready to throw up my hands and quit on this relationship that I have spent six years building.
Your first instinct may be the right one.
I know that sounds flippant, but let's think this through. You're not even MARRIED yet. This is the time when people typically are doing their best to try to treat their partner right. Yet, instead, she's treating you badly. How do you think this will develop from this point on? Do you think it will improve, or will it likely get worse? (Hint: more often than not, the relationship deteriorates with time).
Also, is she sympathetic to your physical exhaustion? Is she accommodating toward your health and fatigue? Or is she only thinking of herself? Is this the sort of selflessness one would expect from a loving spouse?
Just think. You're at the point at which most people describe as the peak, the happiest time of their relationships. So what's next? It can only go downhill. Is this really what you want? If you knew that this was the peak, the best time of your relationship with her, would you continue with the relationship? I know I wouldn't.
It kinda sounds like me that you're a means to an end. It doesn't sound like she's in a relationship because she values YOU as an individual, a lover, a (potential) husband. It sounds more like you're her path to have a family. I was in a situation like that with my first wife/ex-wife. When I realized she didn't value me and that I was only a means to a family and a way of life, I knew I needed to end the marriage. I'm afraid you might end up that way too, if you persist witht this relationship.
I know this is going to sound sexist, but you're 29, and building a career. Your "eligibility" will only go up in the coming years. On the other hand, most women I know have a hard time facing 30. They feel that their "best years" (their words) are behind them, and they get increasingly anxious about starting a family. They feel that their looks will start declining. I know it's horrible that society puts so much emphasis on a woman's looks, but it does, and that's a reality that they have to face. Is it possible that this kind of anxiety is underlying her badgering you about starting a family? Sometimes that desperation causes them to force a relationship that really would be better off ended.
The bottom line is that I don't see the kind of concern for your health and your needs that I think your girlfriend would exhibit if she was truly the woman you should marry. I think it will only get worse for you. She may even know it's not right, but is forcing the relationship out of a sense of a need to get married now.
I knew a psychiatrist once who said that he believed you marry the person you are seeing when you decide it's time to get married. Don't fall into that trap. Follow your gut instincts, like you posted above. Move on. I don't think she's right for you.