Self-doubt often breeds insecurity. Insecurity, in turn, shatters our confidence.
Hence, too much self-questioning is not a fruitful undertaking.
So, when you feel a lack of certainty, do this: breathe deep, identify the intruder thoughts and silence them. Let them pass and be on their way.
Learning to quiet our minds, in the chaos and the noise of the everyday, is our most powerful ally to building confidence.