Why do we tell stories?
We tell stories to help us understand each other.
We tell stories to give an example of how or why we feel a particular way.
It is a way of finding common ground and sharing experiences. It can feel very positive when someone has had a similar experience and we feel that they understand where we are coming from.
We tell stories because we can! Since prehistory we have shared stories or narratives, originally in pictures or symbols drawn on cave walls. There is a wealth of information on wikipedia about some of the traditions of sharing stories over the years.
Stories often take on their own life and it is the story we remember not the actual event. This is a way of keeping memories alive that might have faded. It may be worth remembering though that sometimes stories are embellished, or we only remember what we want to.