Contrary to popular belief, not all loners have a pathological fear of social contact. “Some people simply have a low need for affiliation,” says Jonathan Cheek, a psychologist at Wellesley College. “There’s a big subdivision between the loner-by-preference and the enforced loner.” Those who choose the living room over the ballroom may have inherited their temperament, Cheek says. Or a penchant for solitude could reflect a mix of innate tendencies and experiences such as not having many friends as a child or growing up in a family that values privacy.
I think the term loner is misleading but otherwise this is good stuff