You searched for: “catoptrophobias
catoptrophobia (s) (noun), catoptrophobias (pl)
An excessive fright of mirrors that may be based on ancient fears and superstitions about reflections: The earliest known looking glasses were the quiet waters of pools or ponds. Primitives believed that when they saw their own images in pools, or any other reflective surfaces, they didn't just see an exact likeness of themselves, but their own souls looking back at them.

In the past, "catoptromancy", or mirror divination, was practiced and so it might have caused people to have catoptrophobias.

A slim girl has a fear of seeing herself in a mirror as being overweight.
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Some people who have catoptrophobia are afraid of looking in mirrors because they may see themselves with physical conditions or appearances that are not realistic.