Oh! I'm going to present the following in good faith.

You're referring to sex. Sex is biological, gender is a concept. Sex is related to your hormones and your healthcare and what's in your pants, but the idea of masculinity or femininity being tied to specific behaviors or clothes is a social construct. (Gender.)

IE; I'm a woman. Very much a woman. Super secure in that. I've got all the parts, enjoy having them. When I go to the gym or when I drink my cousins under the table or when I work on a car, those things shouldn't be tied to an idea of being masculine, because I'm not suddenly more masculine for doing them. I'm definitely still a woman the whole time. That's the difference here, is that there's a concept of gender which is different than sex.

Of course it's not devoid of the effects of sexual dimorphism. It's just that how one's sex determines societal roles and stereotypes (a closer definition of gender), shouldn't be so rigid and unmovable.

Body image and psychological stuff still fall under societal influence rather than biological influence, and the hormones we produce are fundamentally a sex thing, not a gender thing.

Something being a social construct doesn't mean it doesn't have a tangible influence on how people feel, it just means that it isn't based on intrinsic biological fact. What constitutes being a "man" or a "woman" differs between cultures and between people, it is often tied to biology because of societal expectations and association, but it doesn't actually come from biology. Something like pink being a girl's colour or women wearing makeup or men drinking beers instead of daquiris, those are all arbitrary performances people put on based on what society tells them men or women should do. Even the pronouns he/she were invented, some languages don't have gendered pronouns by default like English does. None of that comes from biology, biology doesn't tell us what pronouns we use or what we should wear.

Wow careful with that logical thinking buddy, we don't like that here \s