It is made up Not all men are the same emotionally. However, they are men. The same can be said about women.
Of course it is made up. What it means to be a "man" has always been made up, and it is different from society to society. This has nothing to do with science... it is sociology. Your idea of being a man is what you were taught growing up.
Men haven't always worn pants. In fact men in societies from ancient Egypt and Rome to Elizabethan England wore makeup.
Your idea of what it means to be a "man" is just as made up as anyone else's. It is all made up.