Same here. I remember about once a year growing up the school would have a day or so dedicated to the topic. I remember once as a pre teen my mom tried to give me a book on puberty for some reason. I found it embarrassing so I never read it but I never felt I needed to. The school's teachings were sufficient.
Iirc as a younger kid they focused a bit more on changes to your own body. And then as I got older, they got to talking more about the physical act of sex.
What are you talking about?