False starts are part of life.
Certainly, I’ve had a lot of projects that started with promise, but which never seemed to get completed. Others may have been started several times, or re-concieved mid-launch, such as this very website. Most of my half-baked, orphan works have either never seen the light of day or been safely scrubbed from the great digital subconscious before anyone else became aware of them, thankfully. But, there’s a market that celebrates that bastard child of the creative process. An e-zine called The Orphan.
Go, and be gratified that those half-finished pieces you have cluttering up your desk or your hard drive are more common than you think. You are not alone.