No, you can’t identify as whatever you want.
No, you can’t be transgender without dysphoria.
No, you can’t be a lesbian if you’re a guy.
No, you can’t use she/her pronouns if you’re a guy.
No, you can’t use he/him pronouns if you’re a girl.
No, you can’t be bisexual without having same gender attraction.
No, you can’t be gay for someone of a different gender.
Words have meanings.