attraction confusion - do trans women have to be into men?

hey everyone, so i'm pre-transition and wondering about something thats been bugging me. i'm with my girlfriend who's super supportive and amazing about everything, but i keep running into people who seem to think transitioning means you automatically become attracted to guys? like i know gender identity and sexual orientation are totally separate things but there's this weird pressure i feel sometimes. just wanted to check with other people here - am i overthinking this or do others deal with this assumption too