Masculinity is an ideology of patriarchal societies that generally justifies the advantages that men have over non-men systemically. It maintains its power through constant propaganda throughout the society similarly, but not exactly, to whiteness with race.
That's...not masculinity
It's a concept, and an unnecessary one at that
But it sure ain't masculinity
You just have a different concept in mind. Maybe you're thinking of "maleness" and equating it with masculinity.
Definition of masculinity in English:
masculinity
NOUN
mass noun
Qualities or attributes regarded as characteristic of men.
handsome, muscled, and driven, he's a prime example of masculinity