happiness does not have a set definition.
and what you have to realize is that you cannot be automatically happy. Maybe you're happy, and you don't realize how insanely perfect it was until it was all gone, until you were left in the dark again.
and you can't force youself into happiness, you just have to try different things, and learn to realize the glints of happiness when you've got them shining in your eyes.
Michael Bublé - Feeling Good