This is how I see a myth....
myth
   /
mɪθ/
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–noun 1. a traditional or legendary story, usually concerning some being or hero or event, with or without a determinable basis of fact or a natural explanation, esp. one that is concerned with deities or demigods and explains some practice, rite, or phenomenon of nature.
2. stories or matter of this kind:
realm of myth.
3. any invented story, idea, or concept:
His account of the event is pure myth.
4. an imaginary or fictitious thing or person.
5. an unproved or false collective belief that is used to justify a social institution.