One of my oldest friends is a natural born storyteller, she is funny, sometimes biting but always entertaining. It seems to me that for her writing is as effortless as breathing, and as someone who has to write 3 drafts to get one coherent, semi-grammatical paragraph, I admit to being pea green with envy.
I think that good writing is a lot like good singing; with some training and and a lot of practice you can learn to carry a tune, but very few people are born with a tuned ear and a true voice. So I practice, practice, practice....