I have a quick question: I created an account on Minecraft and bought the game. If I want to log in now, the password or e-mail address is invalid.
The Pw will be invalid.
Request a new one. If you get sent to his email.
Do I have to buy Minecraft again?
No!
You have a proof of purchase.
In addition, your email is registered.
If you can't find a way, but there's always a new password, then call the hotline.
Googling. "Hotline Minecraft".
Thank you!