Being an introvert does not mean being socially reclusive. It does not necessarily mean that you are shy, a loner, afraid of social interaction, or that you have bouts of social anxiety. According to Carl Jung’s theory of psychological types, extroversion and introversion are related to how a person derives energy. According to Jung, extroverts derive energy from the external world, through interaction and communication, while introverts derive energy from within through reflection, thought, and contemplation.