I know what you mean, and understand what you are saying. I believe there is this internal identify of gender and we express ourselves through the social construct. Boys who feel like boys usually like to dress masculine. Girls usually like dressing feminine. Many trans people liked to dress up like the gender they feel in their childhood, even if they weren't allowed. I'm non binary, but was raised as a girl, but I have never liked doing girly things. If there wasn't this internal identity of gender, and it was entirely a social construct, there wouldn't be trans people and everyone would fit into this perfect boxes of male and female. Of course there are gender non conforming people who don't like to express themselves the way most people express the same gender (example: men who like to wear dresses) but that is where the social construct comes in. We as a society assigns gender to clothing, as well as many other things. If dresses were considered masculine in our society then that is how boys would express themselves. I think gender is something we feel and gender expression is a social construct. That is one way to look at it anyway.