Storytelling is a task shared by storyteller and story listeners,-
it is the interaction of the two that makes a story come to life!
Give your characters personalities...live the story with them...know and feel their emotions...
breathe the breathe of life into them, until they become so real to you
that you feel like they are people you know.
If you are convinced - your listeners will be too.
Most importantly --- relax and be yourself. Develop your own style - one you are comfortable with.