Just as a PP said on another thread, your mental map of your body probably is a part of a "gender identity", along with the masculine self that feels like you.
I wouldn't put it that way. I only have the mental map, with its phantom sex characteristics. I wouldn't call it a "gender identity" because it's neither about gender (it's about sex) and it's not an identity (it's physical phantom organs). I'm also not sure what "masculine self" you refer to? Is it my masculine presentation? Then yes, it feels like me but that's only because it brings my physical appearance more in line with my mental map, so I "recognise" myself better.
I'm tempted to read that book you were recommended by the PP who said it and come back here in some kind of book club capacity to discuss it with the PP and you.
I've started it, and I think I'm gonna like it! Do tell me if you read it and want to discuss it.
I hope I'm not unfairly planting an "I'm a believer" sticker on you if that's not how you see things.
I... think you are? The only thing I believe is my brain's faulty map. I don't believe I have any male part in me: no "soul" or anything of the sort, no identity, nothing of the sort. When I say, "I feel like a man," I mean, "I physically feel like I have male bits, and like I shouldn't have female bits".
So I wouldn't call myself a believer, because I have been a believer in other things, and it's not the same mechanism or feeling at all, at least for me. To me, a belief is not based on fact. There may be evidence but not outright proof. When it comes to my faulty mental map, it's a fact that it exists. I can't show it to anyone else, true, but to me it's absolutely real. It's the only map I have, after all, and it's not like I can plug a USB key into my brain and download a more accurate one, you know? So I have to do with this one, even if I know it's faulty. I can consciously compensate to a degree, but that requires an effort, it doesn't feel natural, because I'm literally going against what my brain "knows".