How did my entire email account end up on the internet for the whold world to see? If not you, who does know?

The dropdown on the address bar shows my account,not temporary addresses.
How did my entire email account end up on the internet for the whold world to see? If not you, who does know?
Prophet could know.
Reply:Change your nick name now. I guess they must have guessed from your nickname, like, example my nickname being 'chamwen', they can easily try send emails to me at this address,'chamwen@yahoo.com' which I will never receive. Or alternatively, try change or register for another email adrress.
last name