The fitting room mirror, the bathroom mirror and the car mirror all disagree about you. None of them gets a vote.

Three mirrors give three different answers about the same face, which tells you something useful: each one is reporting on light, angle and cheap glass, not on you. The bad one is not the true one. It is just the one that caught you at an unflattering moment and happened to be where you were standing.

When a reflection flattens your mood, say what it actually is out loud: bad lighting in a small room. Then get on with your day rather than reorganising your opinion of yourself around it. If you want a real read on how you look, a photo taken by a friend is closer.