not sure but i think sexual orientation is : hetero sexual ; Homosexual ; bi etc. Sexual identity is how one thinks of oneself in terms of to whom one is romantically or sexually attracted. good luck
Gender identity is your own, internal, personal sense of being a man or a woman (or as someone outside of that gender binary).
Sexual orientation describes a person's enduring physical, romantic, and/or emotional attraction to another person (for example: straight, gay, lesbian, bisexual)
