To form a sense of self, we must understand that we're truly an evolving sum of our experiences: the places we've gone, the things we've seen, the mistakes we have made, the successes we've found, the paths we got lost on, and the people we love.
Plato said "I must first of all know my self." Maslow believed "what a man can be he must be, this need we call self-actualization."
Throughout life, we cannot understand how others view us unless we are willing to search for who we actually are.
So travel. Eat. Make mistakes. And love. By doing these, you're one step closer to finding you.