The ultimate quest of the entire world is peace. Only in peace do we have joy. Not by acquiring things; not by earning and learning; but by RENUNCIATION. Without peace there is no happiness, and without dedication there is no peace.
The only way to be happy is to dedicate yourself completely to God or to His manifestation the universe. Put the world first and yourself last. Then and only then will you really find peace and joy.
To free yourself from 'I' and 'mine', that is what is meant by moksha, liberation. Understand that we are bound by our own selfishness. No man is free until he is free from that.
Look at the entire nature. There is sacrifice everywhere. Everything animate or inanimate lives a life full of dedication. You do not find even a little bit of selfishness in their actions. This is the basic teaching of all religions: give, give, give. Let every minute of your life be useful to humanity. Bring peace and joy to everybody. This is the only way to true happiness. There are no shortcuts.
Make the whole life a Yoga. Your body will be healthy - your mind will be peaceful, your life will be useful. The whole world will enjoy your presence. What else do we want? It there any thing more: Lokaa Samastaa Shukino Bhavanthu! May the whole universe be filled with peace and joy.