The reader actually wants to read your stories. If you are in the middle of your story and the plot is at it's climax, sometimes you can just think, "I can't do this. It is way too hard." If that happens just think, "Hey, I've got this far, how about going just a little bit further?"
When I write stories, I always think it's too hard, and leave . On my computer there are a lot of unfinished stories.
If you are REALLY finding it to hard, leave it for a bit then go back to it.