Happiness is always a byproduct. It is probably a matter of temperament, and for anything I know it may be glandular. But it is not something that can be demanded from life, and if you are not happy, you had better stop worrying about it and see what treasures you can pluck from your own brand of unhappiness.
This is what the world honors: wealth, eminence, long life, a good name. This is what the world finds happiness in: a life of ease, rich food, fine clothes, beautiful sights, sweet sounds. People who can't get these things fret a great deal and are afraid, wear themselves out rushing around on business, spend night and day scheming and scrutinizing. Man lives his life in company with worry, and if he lives a long time, then he has spent that much time worrying. This is a callous way to treat the body.