In any given event, there are many stories.
How do we choose whether to tell Cinderella's story (as an example) from her point of view, or the prince's, or a stepsister's? As that point of view shifts, how do the beginning and ending points of the story change? How does the theme change?
One of those stories will have an arc and a theme that resonate with us. That is my story, an inner voice says. That is the story I have to tell. This is what I believe to be true.
There's a point where we shift from imitation--from telling our myths and stories the same way we've received them--to creation. A point where we take hold of a story and shape it according to our own beliefs and experiences. Having learned from others what stories are, we begin to tell our own.