All Just A Story

''Oh, my God! My entire adventure was all just a story being told by an old man to a bunch of children!''

When at the end of the story, it turns out it was no more than, well, a story. But it's a story that's being told by someone to other people like a grandmother telling her grandchildren about her adventures when she was younger or a preschool teacher reading from a book to their class. This can only make sense if the story had a Narrator and said Narrator is the one actually telling the story, not just narrating over an otherwise regular story. This can't happen in books since that'd be very strange how someone is reading a book to other people within a book. It'd also be awkwardly written in as a surprise being pulled on us.