A few years after transition (1974), I thought about that phrase ("a woman trapped in a man's body") and I realized I didn't have a friggin CLUE about really being a woman prior to transition. Sure, I had all the classic symptoms (long before anybody knew what they were). At one point early on I thought I must be a girl because I sure as hell wasn't a guy but by my mid teens I felt more "freak" than anything else. "Transition" was a snap and girl's life fit like a comfy old slipper. I integrated so quickly and easily that it was incomprehensible to others that I could have ever been anything else. But fact is, prior to transition, I could NOT know - only speculate.
On the subject at hand, Krystal, you aren't that unusual in what you think and feel. I was pretty much the same way prior to transition, right up to having unexplained levels of cyclic estrogen. After transition, it all became irrelevant.
It wasn't until many decades later that I learned a number of facts that pointed to a possible/likely Intersex condition. The "easy tests" were no longer possible (after SRS) so I am slowly wading through the more complex testing.
My first question to you would be if you have had your hormone levels checked. If they are abnormal (for your presumed sex), you could have one of a number of 'Variations in Human Sexual Development"