I genuinely thought this was true in middle school and got confused when my friends didn't want that (it was still true for me though I'm totally cis you can tell by the way I am)
Yeah, I was pretty much convinced of the same thing while still in school: How could my class mates not want to change their gender? It's the most amazing thing in the world to do! Who would say no to that?
not necessarily for you but for other trans people reading - transition isn't going to make you cis but it can help a lot of things. at the very least, hormones can potentially provide a lot of mental benefits, even if you won't get the exact body you want at the end of the day
and, y'know, if they don't, you can always stop taking them