Introverts are habitually perceived as being shy, antisocial even, and have gained a reputation for preferring solitude over the company of a noisy crowd. While it's true that introverts find solace in being alone, this doesn't happen for the reasons you might think.
According to doctor of psychology Perpetua Neo, it all has to do with brain chemistry.
Known as the "feel-good" chemical, dopamine is a neurotransmitter that helps control the brain's reward and pleasure centers. Because introverts have a lower threshold of dopamine sensitivity than extroverts, they are more easily stimulated and get their dopamine "fill" faster. This makes them become more easily overwhelmed by highly stimulating social situations, such as a crowded party with lots of people and noise.
"As an introvert, you are more energized by spending time on your own, or in very small intimate groups of people you trust," Neo points out.
By comparison, extroverts thrive in highly stimulating social environments and, instead of feeling drained like introverts would do, they actually recharge their batteries by interacting with as many people as possible.