Especially in the first half of life, introverts are most interested in discovering exactly what it is they have to offer the world. They see self-knowledge as a prerequisite to authentic action. Without an adequate map of themselves, they feel lost and aimless. For them, external circumstances are far less important than self-understanding and self-direction. Once they have a sense of who they are and what they should be doing, they feel they can be happy anywhere.
-Dr. A. J. Drenth