As Seth Godin so aptly points out, all your ideas have been someone else’s already.
No matter how original you think you are, you’re not.
In fact, the only thing that distinguishes “your” latest stolen flash of inspiration is that you now have a chance to make it your own.
And if you’re not the first person to make it up, you can at least be the first to make it work like only you can.
Let’s Get On With It!
Jonny
PS – Warning: If you do have an idea that’s genuinely original and never-been-done-before, it’s probably rubbish.