No, your work will probably never be as good in reality, for you, as the perfect wonderful glittering brilliant thing it was in your head when you imagined it.
But other people do not know what you imagined. They only know what they read or see or hear, and for them, the thing you have made may well be wonderful.
And if you fail… is it that bad? Nothing wrong with failing. We do it all the time. At least three stories by me are so utterly rubbish I’ve never collected them. You don’t set out to make bad art, but if you are going to make art, not everything will be perfect, or even good.