I agree with Elis on this one. I'm sorry to tell you this, but if she's already left you 5 times, she's not the right woman for you. You may love her with all your heart and soul, but clearly she doesn't feel the same way about you because if she did then she wouldn't keep leaving you for other guys. And no matter how much you may want it, you cannot make someone else love you the way you love them.

Not only that, but I can tell you from personal experience that if your partner is a 'big family' person, they'll
always put their original family above you and above any family you might potentially make together. And if her family has religious or other cultural reasons to reject you, then I don't foresee a smooth future for your relationship at all. They're going to keep haranguing her from the sidelines about her 'lifestyle choices'

and she's going to be torn between them & you, constantly trying to keep the peace between two warring factions. Just as you cannot force somebody to love you, you also can't force their family to accept you - and I can guarantee that parts of her family will keep trying to split you apart because they don't like seeing her with you. If she's a 'big family' girl, then she'll side with them instead of you. (How many times has she left her family? How many times has she left you? There you go.)
I'm a little concerned about what you said about a part of your decision to transition was due to her. That's fine, and I'd imagine that some part of your decision to transition was because she's primarily attracted to men and you may have wanted to fulfil that need for her. I understand that completely. But take her out of the equation. Imagine your next potential partner: a woman who loves you to pieces and treats you right. Would it be important to you to be a man within that relationship? Or would you be equally happy (or more happy) within a lesbian relationship? Would you not care either way?
The answer to that question will help determine whether you've made the right decision in transitioning. If you still feel you need to continue transitioning irrespective of what a future partner might be into, then you know you're on the right path. If you think you'd rather abandon your transition than lose your current girl, then that might suggest that you're mainly or only doing it for her, and you might come to regret it later. How do you see yourself in 5 years' time? How do you see yourself in retirement? Would you be comfortable with being a woman?, or would that devastate you? Picture your 75-year-old self, looking back upon your life. What would you regret more: living as a woman, or living as a man? These are the questions you need to ask yourself, to help decide whether you're doing the right thing.
There's no such thing as being 'man enough'. You are already enough, however you present and however you perceive yourself and whatever parts you have. If your current girl is making you feel like you're inadequate, then she is definitely not the right one for you.
I'd walk away if I were you. This relationship can only end it tears, so you may as well rip off the Band-Aid now.