People universally tend to think that happiness is a stroke of luck, something that will maybe descend upon you like fine weather if you are fortunate enough. But that's not how happiness works. Happiness is the consequence of personal effort. You fight for it, strive for it, insist upon it, and sometimes even travel around the world looking for it.
Life always gives us exactly the teacher we need at every moment. This includes every mosquito, every misfortune, every red light, every traffic jam, every obnoxious supervisor (or employee), every illness, every loss, every moment of joy or depression, every addiction, every piece of garbage, every breath.