my 2 cents:

none of what you’ve written here indicates you weren’t born gay.

“…wish i was in the woman’s shoes in porn (autogynephilia), that was my first homo sexual desire.”

that doesn’t sound like you were “simply born straight”

your post strongly suggests to me you have a lot to learn and accept about sexuality.

“always had a totally masculine identity, male engagements”

saying something like this indicates to me that you don’t understand the complexities of masculinity, femininity or sexuality.

did you read a lot of books as a child? is that masculine or feminine? did you climb trees?

assigning labels and expectations to your behaviors may be why you don’t view your own sexuality as “a case of normal, stable homosexuality”.

which is what it sounds like you are discovering: a case of innate normal, stable homosexuality.