People are unhappy, because, they do not know the Reality of their Self. There is no real Self without knowing The Truth.
Living for any other purpose can have no lasting meaning, freedom and happiness.
No one throughout time was able to find enough power in the world, which could protect against life and death, or end fear and sorrow while living. Even Emperors, Pharaohs, Kings, Conquerors died unhappy, weary, unfulfilled, and humbled. Any kind of worldly power is limited, and futile without spiritual knowing.
Life is precious, and is for knowing and living the Reality of the Self. Do not waste it in illusions, ignorance, and arrogance. Real happiness does not exist in material pursuits. Open your eyes in time and see this unchanging fact of life before it is too late.