Introversion is a basic personality style characterized by a preference for the inner life of the mind over the outer world of other people. One of the Big Five dimensions that define all personalities, introversion sits on a continuum at the opposite end of which is extroversion. Compared to extroverts, introverts enjoy subdued and solitary experiences.| Psychology Today
Anxiety is both a mental and physical state of negative expectation. Mentally it is characterized by increased arousal and apprehension tortured into distressing worry, and physically by unpleasant activation of multiple body systems—all to facilitate response to an unknown danger, whether real or imagined.| Psychology Today
Adolescence is the transitional stage from childhood to adulthood that occurs between ages 13 and 19. The physical and psychological changes that take place in adolescence often start earlier, during the preteen or "tween" years: between ages 9 and 12.| Psychology Today
