my definition of gender identity - `the way your personality/identity interacts with your biological sex`
biological sex - `genitalia, chromosomes, bone density, etc`
i think that gender identity exists because we human beings need a way to connect our personalities/identities to our bodies, so gender identity kind of serves as a bridge between them. gender identity disorders, therefore, are when the identity doesn't line up with your sex, which results in transgender people - AGP/HSTS on the other hand requires your gender identity to be male & sex to be male, since AGP/HSTS is a function of cis male sexuality
in my case, you would call me a cisgender male because i "feel" like a male, & my biological sex is "male". me "feeling like a male" is what my gender identity does, without a gender identity i wouldn't have any emotional or personality connection to my body.
in other words, your gender identity is a component of your personality responsible for helping you understand & connect to your body when it comes to your biological sex. it's responsible for how you perceive yourself, & whether your body is the right fit for you or not. my gender identity is responsible for me having feelings like being really uncomfortable with people calling me female/referring to me femininely