I think it started really young like when i was about 8-10 don;t know precisely honestly, that my perception of women changed. I think it was because when girls started pinching boysto get attention i would just look them in they eye in stead of reacting. They couldn't break me so they just lost interest and teased the other boys.
Which is honestly the youngest i remember of what might have sparked it. I was also always a very good young boy, so much even that my teachers where even conserned that i wasn't getting into antics.
When i was about i think 10-14 i honestly have no idea i started coming up with these stories, i never told them to anybody. But i made them up to help me sleep. They usually concisted of a world where women ruled, so much so that men where always overpowered by them. A few examples i could think of was a world where men where used like objects like atm's and such to serve women, or even one where there was a kind of a war raging between guys and girls and they build a massive wall to keep the two genders from colliding and i always wished i was on the other side. And my last example is where i was sent as a spy to the girls and they caught me and made me into some kind of cyborg girl. So they basically turned me into a girl and let the boys see me as a girl to humiliate them. And all of this wasn't really sexual, or at least i didn't realize it was sexual.
But when i got to my teenage years, i remember when i was about 12 that i found a website of a dominatrix. And the story's of the customers got me so horny that probrebly was the real origin point where i hooked it the fantasie to femdom in my brain.
Of course my point of view that women where far greater than men existed from a young age though. Probrably because the girls in my class where usually smarter because the developed faster then boys. Making me look up to them, also the general media telling us that women should be treated like their diamonds even if they behave badly. Gave me the idea that women where far greater than men.
And when i started fapping to femdom there really wasn't a way back since my brain probrably attached all those fun processen to femdom building them up even further.
It wasn't till late high school i realized that girls aren't that special and there just people.
So the point of this story is pretty much that it probrably happened way back in your childhood, whereafter it was emphasised multiple times that women are better since they should be threated better. While nothing of sorts is said about men. This is also especially aparent in the tv show married with children, which portraits the women as princessen that should be worshipped and can do pretty much everything without ramifications and sit on their butt al day.( of course later in life a different message can be gotten from it).
If you really wish to know where your idea came from i would talk to a psychiatrist about it, he or she might be able to help you find back those memories. And maybe even give you a little peace of mind.