If you've ever felt that way (or even if you haven't), please take two minutes to watch this clip... (thanks to @gcouros for sharing.)
Interesting idea raised here, isn't it?
Maybe you do have brilliant ideas. They just don't seem brilliant to you, because they're your thoughts.
What difference does this make for you?
Do you feel creative? Do you think of your work as brilliant? Innovative? Interesting? Outside-the-box?
Maybe others do, or would if you'd share your ideas. Something to think about...