A mermaid (from the Middle English mere in the obsolete sense ‘sea’ + maid(en)) is a legendary aquatic creature with the head and torso of human female and the tail of a fish. The male version of a mermaid is called a merman; the gender-neutral collective noun is merfolk. Various cultures throughout the world have similar figures. They were known to sing sailors to their deaths, like the Siren, or squeeze the life out of drowning men, while trying to rescue them.
I know many beautiful people and their lives are just so terrible. They feel so uncomfortable with themselves. Being comfortable is not about what you look like, but how you feel.
The Sirens of Greek mythology are sometimes portrayed in later folklore as mermaids; in fact in some languages the name sirena is used interchangeably for both creatures. Other related types of mythical or legendary creature are water fairies (e.g. various water nymphs) and selkies.