happiness is not the meaning of life, happiness is purely a state of mind
(damn man that shit reminds me of something OMB would say RIP)
but yeh happiness is just an emotion experienced by life's pawns (i.e. eveything in existence) realistically the meaning of life is to self-sustain, i.e to not go out of existence (by reproduction)
think about it, anything that has become extinct has failed in its survival purpose
so go forth and fuck about just make sure you knock someone up in the process