I believe there is no higher purpose to our lives than ourselves, and thus we are liberated from any possible meaning -- free to choose anything we want. Our collective consciousness is the greater good we search so desperately for, but are actually a part thereof.
To take on this perspective, consider for a moment that you are some sort of celestial being that created the entire physical universe. Do you really need a higher reason to create something so wonderfully beautiful, intriguing, and vast? Why is reason needed at all when you have control of all existence? Wouldn't you be extremely curious about what you could create and experience from your power?
Suppose now that we and everything we see are a part of such a creation. Essentially, each of us is a tiny part of our higher consciousness because we've been created within it. Our physical brain and bodies provide us special limitations to which we experience our piece of existence here.
Now, through our limitations we gain unfathomable room for growth by experiencing and overcoming our challenges and also by providing experiences and challenges for other parts of our consciousness. If we have any meaning at all, it is one set specifically by ourselves which develops our own piece of our higher being. Even if we set no meaning for ourselves at all, our higher self will still gain something new from it, albeit maybe not as much had we set one.
This is a snapshot my understanding of reality so far. It may not be completely accurate, but it brings me acceptance with death, a reason for why we exist, and drive to live my life to the fullest.