Solitudinarian
Part of speech: noun
Definition: One who remains solitary.
Recluse
Part of speech: adjective
Definition: (now rare) Sequestered; secluded, isolated.(now rare) Hidden, secret.
Part of speech: noun
Definition: A person who lives in self-imposed isolation or seclusion from the world, especially for religious purposes; a hermit.The place where a recluse dwells; a place of isolation or seclusion.A brown recluse (spider.)
Example sentence: I feel akin to the Platypus. An orphan in a family. A swimmer, a recluse. Part bird, part fish, part lizard.