Today I wanted to log into Minecraft and saw why my email changed to one of these microsoft passwords, no idea why. Then I wanted to change it but couldn't find a section with change email.
Since every Mojang premium account will require a Microsoft account from January 2021, it will probably no longer be possible to change e-mails in order to prevent accounts from being hacked. Could be, I'm not sure, but it would be an explanation.
So wait until you get an email from Mojang with instructions.
So you can't do anything until then?
I don't think so
OK thank you