Maybe it’s because you don’t get what the terms really mean. Extraversion and introversion are orientations; the terms describe how interaction with the world affects the self. Extraverts face outward; interaction with others is a fundamental thing for them. Self-appraisal and self-knowledge don’t happen in a vacuum; they come about through comparison and contrast. Successful interaction leaves extraverts feeling surer of their place in the world, and more certain of who they are. When they are denied interaction, they feel uncertain and unhappy, or at least unsatisfied.
Introverts face inward, and interaction with others serves several purposes, none of which is as fundamental as what I’ve described above. They have fun, collect information, show off – lots of things. But self-appraisal and self-knowledge, however informed they might be by the things heard in the world, occur strictly within, when other people are not drowning out the inner voice. Introverts need their alone time for things like this, and if denied it – if forced to deal constantly with the onslaught of other voices, they feel rootless and unfulfilled, and above all, they feel tired.