Mirrors are one of the most direct dream symbols for self-perception, because the dreaming brain is using an object whose entire function is reflection to examine how you see yourself.
A normal reflection
Simply seeing yourself clearly in a dream mirror, without distortion, often reflects a period of relative self-acceptance or clarity about who you are and where you stand.
A distorted or unrecognisable reflection
This is one of the more unsettling mirror dreams, and it usually points to a gap between your self-image and how you fear you're actually perceived — or a period where you don't feel like yourself.
A cracked or broken mirror
Often relates to a recent hit to self-esteem or identity — an event, comment, or realisation that fractured how you see yourself, even if only temporarily.
Someone else's reflection appearing instead of yours
This more surreal version can point to a sense of being overly defined by another person's expectations, or losing your own identity within a relationship or role.