Shyness is a personality trait related to.biology and experiences. shyness related to the brain cannot be changed. parents can provide a nurturing environment that helps prevent shyness. For adults.the issue is.more to treatment than prevention.
The answer depends quite a bit on your age. Those who are naturally shy when young will often grow out of their shyness as they become more confident with age. Persistent or chronic shyness into adulthood can be overcome with psychotherapy.