How does Shazam introduce himself without others?

If he wouldn't have anyone else to introduce him then how will he say who he is without divulging his secret identity?

He can say Shazam without changing now. He gained the ability ever since they changed his name.

@darkthunder:

In the comics he only transforms when he wants to now.. As far as the movie he’s effed lol.

@mr_shazam0920: i wonder if that was done on purpose? To be honest I would love it if he decided to call himself Captain Thunder if not Captain Marvel.