Ohhh, you're writing original stories? :D Good luck!

And for what it's worth, don't let those thoughts get you down. I think every writer gets them. I know I do. I think the best advice came from Anne Lamot, who wrote in her essay "Shitty First Drafts" to not be afraid of writing something terrible in one's first draft. After all, no one's going to see it but you. Just write it, she said, and then tweak it as needed. Even if only one sentence of what you wrote ends up being kept, it's still something.

If you don't mind my asking, what sort of a story are you writing? :)