how do you know?

how do you know if you're truly happy? which signs does it confirm your happiness? how do you differentiate happiness from pretending to be? when do you really find yourself happy? which does it take to make you happy, the feeling or the person you are with? does happiness count for everything you have? do people know if you are happy? do we pretend to be happy in order to make ourself happy? does love really make people happy?