Quiet confidence walks differently because it is not checking who noticed.

There is a visible difference between doing something and doing something while monitoring how it is being received. The second splits your attention, tightens your movements, and shows. Confidence that is not checking for an audience simply has more of itself available for the task.

During your next activity, notice how often part of you is scanning for reactions. Try returning that attention to the work itself. The improvement in what you produce is usually immediate.