A bit late, I know, but I consider the following to be required reading for anyone thinking along the OP's lines:
On the Suffering of the World
If I were obliged to cough up a coherent, empirically grounded 'meaning' or summum bonum of the universe, Earth, natural selection, life itself, etc., I would be forced to concede that the words "agony" and "putrefaction" more effectively communicate my sentiments on the matter than any others. Insofar as the notion of 'The Meaning of Life' itself has meaning, I've discovered that I feel no urgent need to affirm nor deny any grand transcendental metaphysic in order to find myself rest assured in this wretched life. No one had ever promised me success nor happiness in this world, but (in fear of sounding like yet another weary echo of the French existentialists), when armed with the knowledge of my life's essential metaphysical worthlessness, I know also that my life, complete with all its blunders, misfortunes, and glaring imperfections is more-or-less
mine to own and
mine to create.
But these quaint (or reprehensible, depending upon your individual dispensations) sensibilities confer little value to those in truly dire straits. I'm guessing that the OP came here looking for more than sophistry, poetic waxing, and fortune cookie wisdom. Unfortunately, I have little else to offer than shared personal experience and my reflections thereupon. If what you truly require is an over-arching raison d'etre, I sincerely believe that you're barking up the wrong tree here. Humanity's most well-heeled nervous apparati, from Anaxagoras to Augustine, have had literally
millennia to cook up
something verifiable, something genuine, something truly convincing, something with universal appeal with regard to the value of continued existence. As far as I'm aware,
not one scrap of intrinsic redeeming value has ever been propounded that was not in some way subject to critical scrutiny, reasonable doubt, logical invalidation, or outright falsification. That said, I think that the hedonists and existentialists in this thread are on the right track. Though I know it's a tired maxim, try your absolute best to enjoy what little you can in this blessedly short life in which banality and suffering are the rules and not the exceptions; and perhaps consider making it better for those few others upon whom your own happiness may depend (that is, if you feel like it). And if that doesn't pan out, there's always suicide, I guess.