Well said @hranhuk.
Happiness is something that occurs within and around us
It could come from people around you, work, or things you do on daily basis - whichever way happiness sprouts from within us
We can choose to be happy or not depending on how one tackle it from relieving yourself of stress to relaxing and taking your mind of the things that weighs or demoralize your spirit.
Like you rightly said, happiness is natural.