A mirror shows you everything except what you look like to someone else.

You study your reflection alone, in decent light, with your face arranged. Nobody else ever meets that version. What they get is you mid-sentence, laughing at something, concentrating, coming in from the cold, and almost none of the features you catalogue in the bathroom survive that. Your harshest audit is of a person who does not exist outside the frame.

Ask a friend what they first noticed about you and believe the answer instead of correcting it. Spend less of the morning in front of the glass and more of the day in motion. Most people are too busy being self-conscious to inspect you.