Hello Cristine

I am living the same experience, I think. First thing first, identity is something that I perceive as very complex and evolving, and what is important is feeling, and feelings: they really help you navigate in your life and the world around you (source: my personal experience). An important feeling is the sense of reality.
This said, I think that you are the same person as before, only you are not acting anymore. You were wearing a mask, but believing/wishing/having the doubt you were actually that person: it made so much sense, didn't it? Then you discover that, no, you are not precisely that person. I think that transgender person actually wear a kind of mask, a real mask, one made of real skin and real flesh. It is ->-bleeped-<-ed up. The problem is that we are not used (until today) to see transgender people around us, and we are not used to trans-identities, i.e. people with sex and gender not corresponding, living normal lifes without physically transitioning. We also don't know if this is "biologically/psychologically healthy".
I had real excitement with girls, and I think I still enjoy having some sex with a nice girl, but I think I feel the same as you do, I feel turned off in the very aftermath, and I feel kind of guilt, like "Ok, I am faking something here... This is not right, this girl doesn't deserve this... or, what if she analyses me or discovers this faking part of me?".
Also, I think that I got excited both for being that "Mr. Heterosexual", and cause... I was in a kind of porn movie myself XD And that was quite exciting. But I was unaware, unconscious, and I believed that I was a normal guy, and for a long period thay was enough for me, and quite fun as well, despite the weird and toxic feelings I felt on my skin.
Does this make sense to you?
A side note: the fun part about this "mask" is that I think that transgender people do not cease to wear masks in particular environments, even after their transition, as cis people do (e.g.: formal events, or when you met people you don't know, or when you are masking something about you/others - source: my experience and Calvino's concept of "masks"). But for transgender people, there is a serious threat to the identity, which is blurred and confused somehow by their/our bodies.
What do you think about it?
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