I think I know what you mean.
While I have desired to be a woman as long as I can remember, it was only several months ago that I realized I could be. I am also still pre-hrt, but since this realization I have been making little changes - losing considerable weight, shaving the beard I'd had since High School, that sort of thing. I am not behaving overtly feminine but I have stopped trying to exude masculinity; I am just letting myself be me and it is a relief.
I have found, as you seem to have, that while in the past I only ever saw a man I hated, now when I look in the mirror I see a glimpse, a flash of a girl behind those eyes. And yes, it feels like my mind is playing tricks; nothing has really changed and yet I see something different.
Its exciting, and frightening, and I feel like I can pull this off and maybe the world will see what I can see just below the surface, waiting to be free. But also I worry that I am getting my hopes up only to be disappointed...
Best wishes to you on your journey!