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
Boredom is at once both easy to identify and difficult to define. A small but growing collection of scientists have devoted their research to boredom, and some conceive of the state as a signal for change. Boredom indicates that a current activity or situation isn’t providing engagement or meaning—so that the person can hopefully shift their attention to something more fulfilling.| 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