As for how we come to have such varied personalities as adults, science increasingly supports what many of us would suppose: A combination of "nature" (innate biology) and "nurture" (environment and upbringing) shape our modes of behavior.
[Read: Personality Predicted By Size of Different Brain Regions] "It's the old [saying], ' Biology is not destiny,'" said Nancy Snidman, director of research in the Child Development Unit at Children's Hospital Boston.
However, for some it can 'stick', and then action is required.
Although most people think in terms of 'overcoming shyness', it is more likely that you will become comfortable in social situations by learning the strategies of self confidence along with social skills.
A specific disorder is when only some particular situations cause social anxiety.People with social anxiety want to interact with others, but are overcome with fear.Social anxiety disorder is an anxiety disorder in which people fear social situations where they might be embarrassed or judged."There's a lot of variability in the system, which also means flexibility." Born this way Long-term studies tracking infants through early adulthood have suggested that we are born with predispositions to respond to the environment in a particular way.Psychologists refer to this built-in responsivity as "temperament." (The familiar labels of introvert (preferring solitary activity) or extrovert (seeking social excitement) fall under this category.) [Read: Brains of Introverts Reveal Why They Prefer to Be Alone] Temperament-wise, Snidman and her colleagues have seen that about 40 percent of babies are "behaviorally uninhibited," meaning they do not react much when shown novel stimuli.