Introverts are not necessarily shy. They have social skills and self-esteem necessary for interacting successfully with others but simply require privacy to recharge their batteries and they actually enjoy solitude. Shy people want to be noticed, liked, and accepted but they lack the skills and the thoughts, feelings, and attitudes that could help them manage social interaction.
Bernardo Carducci, The Shyness Breakthrough: A No-Stress Plan to Help Your Child Warm Up, Open Up, and Join the Fun
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