The problem isn't that we're not good enough. The problem is that we're afraid of seeming like we're not good enough.
The solution?
To "...grow at peace with the inevitable nature of our ridiculousness. We are idiots now. We've been idiots in the past. And we will be idiots again in the future. And that's okay! There aren't any other available options for human beings to be."
Once we're alright with that, we should be alright with failure. And once we're alright with failure, our lack of confidence should no longer hold us back.
Within this School of Life animation, philosopher and author Alain de Botton imparts some handy wisdom that may help you to become more confident.