Creativity is not something that people have or not. Everybody can have a great idea, but great ideas alone are worthless. It is the execution that matters.
We have all seen things that in theory sound incredible, but the result sucks, and things that are pretty generic elevated to greatness by the execution.
There is the saying that no plan survives contact with the enemy and I think it is the same for ideas. When you translate it from your mind, it will never be the same as what you had in mind, so the only thing you can do is to try and do your best.