I think most of us are story tellers - but we don't have the confidence to set them down. Second hand ideas are like that as well. If you base a story on something you've seen on TV or a book you've read, it'll always be just a bit faded too - no matter how bright and exciting the original was. It just doesn't mean much anymore. If you want to write good stories you need to make them fat.
Skinny stories are no use at all.
Once you've made them fat you have to make them skinny again. You have to cross out any words that don't say much. Instead of 'it was a lovely day' say the day was bright as chilly butter. Well it isn't. No, that won't work.