Introverts prefer solitary to social activities as they get no reward from social activities, but do not fear social encounters like shy people do.
- Shyness @ Wikipedia
Excerpt: According to professor of psychology Bernardo J. Carducci, introverts choose to avoid social situations because they derive no reward from them, or may find surplus sensory input overwhelming. Conversely, shy people may fear such situations and feel that they “should” avoid them. This generally poor reception of shyness may be misinterpreted by the suffering individual as aversion related to his or her personality, rather than simply to his or her shyness.