Uncertainty and anxiety are not one in the same. Uncertainty is feeling uncertain. Anxiety is feeling discomfort about feeling uncertain. Everyone experiences uncertainty. But, not everyone experiences anxiety.

Those who experience less anxiety than others aren't necessarily more certain. They're just more comfortable with being uncertain. It's counterintuitive but you don't alleviate your anxiety by developing greater certainty. You alleviate anxiety by recognizing you will never have the certainty you crave.