Failed Stories

Have you ever started a story and given up on it because it sounds stupid?? That happens to me all the time. All my stories seem to start with a happy family of two or sometimes, but not often, more than two teenage girls and their parents (the girls all have jewel names such as Opal, Diamond, and Ruby) who are all happy, happy until some tragedy strikes. I don't know why, but, after the first 5 paragraph chapter my story just seems so lame and stupid. If you have this problem too, I feel for you. I love to write and make up stories but I just can't get it right and it turns so sour on me. To tell you the truth, one of my stories was about a civil-war-time girl who is sucked into a Venusians (as in Venus alien) flying saucer and is set down on Venus to be a slave. Just how dumb are my stories liable to get??? I wrote, and I quote 'I saw purple, (are those men?) in the ship.'  It is a first-person-narrative and this is the 'heroine' first sighting the Venusians on their ship.
Trixie