If you’re quiet at a party, people don’t know if it’s because you’re arrogant and you think you’re better than everyone else or because you’re shy and don’t know how to talk to people…but you know, because you know your thoughts and feelings. So things like anxiety, optimism and pessimism, your tendency to daydream, and your general level of happiness – what’s going on inside of you, rather than things you do – those are things other people have a hard time knowing.