Unfortunately, gender really is simply what you identify with. I'm sorry if that's not helpful, so let's try this: Gender is one's innate and private sense of where they are supposed to be in the range of physical/mental/behavioral characteristics between masculinity and femininity. It can (oddly enough) be distinct from gender roles, gender expression/presentation, and from your primary or secondary sex characteristics. That is, someone's gender identity doesn't necessarily have to match their gender presentation or their sex characteristics.also, no one answered my question. i was told that gender is not what genitals you have. i then asked what gender is, if not your sex. i was then told "it is the gender you identify with". i then said that gender as we know it is then based on stereotypes. i then asked to define gender without using the word gender, and no one could.
Some examples, for instance, take your typical butch woman -- that is, a biological female (sex characteristics) who identifies as a woman (gender) but has masculine traits (gender expression). Or vice versa. Or, a trans man -- biological female (sex characteristics), who identifies as a man (gender), but who can have a gender presentation distinct and separate from their sex and gender (such as an androgynous gender presentation).
Not sure if that helps, but I'm (and everyone else here) willing to answer any further questions you have (assuming we're all acting in good faith here). And, I definitely don't have all the answers yet, as I'm still figuring stuff out myself. But we can all learn together, right?
edit: changed an example