recluse
n.a person who lives alone and avoids other people. You use this to describe someone who prefers to stay away from society.
n.a person who lives in seclusion and avoids social contact. Often used to describe someone who has chosen a solitary lifestyle for religious, philosophical, or health reasons.
“The writer lived as a recluse in the mountains.”
“After retiring from public life, the famous actor became a recluse, rarely leaving his home or speaking to the press.”
“The philosopher spent decades as a recluse, dedicating his life to the study of ancient texts and the cultivation of a private garden.”
From Old French reclus, past participle of reclure, from Latin reclūdere (“to disclose, to open”), from re- + claudō (“close”).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.