How are the terms masculine and feminine related to gender roles?

OK...so...gender roles= socially determined and accepted ways of acting (loosely..).

Masculine= one who identifies as masculine.

Feminine= one who identifies as feminine.

Masculine gender roles, then, would be activities and expressions accepted by a majority of society to be "manly".

Feminine gender roles, then, would be activities and expressions accepted by a majority of society to be "womanly".

There are issues with this because not everyone falls into this gender binary. It's a harmful system.