Often times, we tell ourselves that we will "be happy" when we finally get that paid internship, promotion, relationship, dream house, or desired income. When in reality, that is not true happiness. Happiness is a state of being, a choice, a mindset.
When we put ourselves in the mindful habit of believing that we require external things to become truly happy, we set ourselves up for an endless cycle of being let down. We often do not need those external things to be happy.