These parts of your post could be written by any number of people active on this site including myself. Keep engaged here, post a few stories in the writing forum, and give proper weight to the feedback. Also, you might want to try some short stories. Its easier to power through when you lose interest and you will have accomplished something rather than suffering the disappointment of one more uncompleted project. It also might be the basis of one of your mash ups.
There is always a story to tell. Most of us are just too distracted to hear it. You honestly don't have to love a project in order to write it. Like and interest will carry you a hell of a long way. Follow those roads, don't dismiss them because they don't scream: WRITE ME! These are the beginning journeys, the ones that teach you what really matters. This is the learning curve and it allows you to finally recognize when a project is truly amazing. Remember these stories are as precious as hearts and big toes, you'll only ever get one or two in your lifetime. Don't let these overshadow the finite moments of wonder still to be had. Appreciate the project you are working on at the moment because no one else will ever make one quite the same. Ask improbable, ridiculous questions. Change your prespectives and look at life from another person's or even another item's point of view. Get out of the box, or if you can't seem to, dig down and away. Fall into wonderland. Use your senses, all of them. Don't get hung up on perfect, it is a nonquatifiable entity. Embrace the flaws that abound, these are what give characters actual, well, character. And remember, in almost every case: The book is better than the movie.