I gotta thank you all quite a bit. You all have invaluable advice, but I don't think I am quite there yet. I am not sure if I ever will be.
What I do think is that I get a bit desperate at times, there is no one I can talk to about my feelings and as a result I come here from time to time and draw upon people who I feel can understand where I am coming from. I wish I could just come out to her, but ultimately such a confession could destroy her. She relies on me as being the "man" of the relationship. I am the comforter and in a role of strength for her, coming out to the world would ultimately place me in a different role and as the result she would suffer.
She is quite open minded, it would never be a matter of her disliking me for being transgendered. I just feel that she needs me in the role that I am in. Perhaps she has a hint of what I am. It could be a journal I left at my MIL's house.. (which my MIL read but I am unsure if it was one where I expressed my true feelings). Perhaps it is just that I am not in any respect similar to what a guy is supposed to be like.. Hell, even my brothers used to say I was girly.. I'm not quite sure why though.
Again, I thank you all. The fact that so many have responded and shown care is quite significant and helps me throughout it all.