What about Fear of water? Phobias: xenophobia definition is a bit simplistic; yes 'strangers' but also more towards the fear of foreigners. Usually, used socially and culturally than just 'strangers' but I digress.
Social phobia - here are 7 techniques for overcoming Social Anxieties. Social phobia is an anxiety disorder involving strong, irrational fears relating to social situations. Genetic factors have a strong influence and males more common than females.