Bipolar Disorder is a brain disorder that causes shifts in mood and can effect your day to day tasks. This can also effect how you live your everyday life and what goes on in it.
Schizotypal Personality Disorder leads to severe anxiety and being inward at social gatherings and many other things that involve groups of people. Typically diagnosed in early adulthood and has treatment ( medications, therpay, ect.)
People with Schizoid Disorder are prone to not forming relationships with people as much or as often as they should. They are typically loners and form better relationships with animals than they would with actual people...People with SPD are in touch with reality unless they develop schizophrenia.