Anorexia is when a person thinks they are fat when they are really skinny. Body dismorphia and there are even people born feeling that they should be an amputee. The list goes on. It is all in their head.

Gender dysphoria Definition: Gender dysphoria (AKA gender identity disorder) is defined by strong, persistent feelings of identification with the opposite gender and discomfort with one's own assigned sex that results in significant distress or impairment.

FEELING! When did someone's feelings become reality? It is a mental disorder.