I was always small and as a kid I actually took pride in using people's assumptions about me in the reverse. I learned that in any physical activity I was severely underestimated and was able to use this against people because they let their guard down so I was able to outcompete them in a 1v1.

I know some people have the opposite experience as you where they want to be big and strong but aren't. I used it in a different way but I fully recognize that I was a really weird child in my ability to be self aware and that isn't going to work for most children.

I hope that perhaps there's a way to teach self awareness to children that the gender boxes don't matter.

My tendency to hide my mental and physical ability wasn't all positive either. I would let other kids around me fail repeatedly by not helping or revealing ways to do things because I wanted to keep the solution in my back pocket so that i could win later. I wouldn't want to teach that aspect to children.