Not the clit, but I remember when I was younger some chick said “girls don’t pee out of their vaginas you know?” And that blew me away. I’m not completely stupid and knew the pee came from the genital area, but when I asked what it comes out of if it’s not the vagina, I was laughed off. Then every time after when I would ask a girl how it was done, they would also laugh me off.
Eventually, years later, I had a very kind girlfriend who explained it to me, but the point I’m trying to make is that yes, these things are less common knowledge than you know. And a portion of that is due to people like yourself who assume these things are common knowledge and seem surprised to find out they aren’t.
When sex-ed only teaches you about stds and protection, and porn generally never appeals to the other sensual parts of a woman’s body like the clit, neck, collarbone etc, it shouldn’t be that surprising considering how much one is left to figure out on their own.