What is something you believed was normal or true as a kid, but later found out it was not?

Abuse (verbal and physical) being normal

that you can "unlearn" autism and adhd (aka forcing someone to mask)

that the tides do affect rivers and lakes (that one i only learned last week)

drinking alcohole at a young age and drinking lots is normal and okay

weed smokers with the image of typical drug users

anything religiouse (though even in second grade i unironicly said "i belief only in facts and science. Mrs Teacher, is there a religion that is about the facts of science?" Yeaaah the autism has always been strong)