Because Freddie had a belief in himself in addition to immense talent. Brian May said Freddie was an eccentric musical genius that his band mates did not quite realize until he was gone. Brian said Freddie was so sure of himself that his attitude was: I’m going to do this & if you disagree, just get out of my way. In an interview Freddie once said that you simply cannot consider failure. “You consider failure & you fail.”
On top of his attitude & drive he had immense talent. But even that he moulded into what he wanted. Brian said when they first got into a studio, Freddie was singing the way he did onstage, screaming & posturing. When Freddie heard it, he said—no, I’m not having that. According to Brian he kept altering his style until he got the controlled vocals we came to know. Freddie made himself. He lived music to the end of his life & by all accounts died at peace on his own terms.
“You can be anything you want to be. Just turn yourself into anything you think that you could ever be.” Freddie Mercury