I really wish someone had told me that sometimes people are non-binary when I was growing up.
I'm not non-binary myself, but it would have made a big difference.
I'm biased but I suspect this isn't uncommon. There are so many stories where the theme of "be a man" or "be a real woman" is central. And so many people I know have told me the most painful parts of growing up related to having their ability to correctly do gender questioned or belittled. Why.