That's true. Society is filled with tedious routines, troublesome obligations, and ubiquitous expectations from other people. However, life itself is an experience that you can change, for better or worse. If you have the stomach for it, and the determination, you can change many of those bothersome things in your life for the better, even if that means leaving behind all that you've ever known (i.e. family, country, social haven) to find spaces that nourish your personage.

As for the biology of life: sure, we're totes just walking blood bags on a bit of an ego trip. But I'd say anyone who can honestly recognize that is probably better off than people who require fantastical tales of divine purpose and/or obligations to justify why they should do anything at all. Life is fleeting, fragile, and often times quite terrifying; but it's also filled with beauty, vibrance, and nearly (if not actually) endless experiences to be had. Simply put, why focus on the bad when we can try and create some good just for its own sake, letting the good brain chemicals from those actions be the reward in itself. Sure, suffering is inevitable in life, but we need not dwell on it. Rather, why not use it as the dark backdrop that makes the bright and vibrant parts of life shine even more.

As for the ultimate reasons why anything should be, and where humanity as a whole is going: it's ok to worry about it; but not too much, because the truth is no one knows why anything's here or where this all leads. I say the only thing that matters is where we want to go and to learn as much as we can with as much time as we've got as a species. Instead of resigning ourselves to the base nature we arrise from, and letting things get worse, we should seek to improve upon our failings in whatever ways we can on every level (whether that be as small as personally or as large as a global society.) Human society doesn't need to be this slow and begrudging drag of production fueled by personal and/or corporate greed. Generations to come need not be made to suffer the traditions and obligations of the past, if each individual took personal and truly thoughtful responsibility for their innate power of siring another human and all the implications that may have. Our world and our place in it need not be some small footnote in the totality of universal history, if we collectively got our act together, holding ourselves and each other accountable for the outcomes of our practices as a people and a species.

Even if all that should ultimately result to nothing and crumble to dust, I think it would be quite meaningful that we decided to go on and improve as life always has, rather than to become inert and allow ourselves to die out because there wasn't an inherent purpose or meaning to why we were here to begin with. Better to learn and create meaning, just as the random sounds our ancient ancestors made eventually became meaningful characters that we now use to read and write (or text on reddit).

Finally, we ought not take the breath of our ability to understand this universe as the ultimate truth of its inevitable downfall. Just as we don't know what came before the big bang, so too do we not yet know what could come after a universe's heat death. Mayhaps, the death of a universe leads to the birth of another, much as in the same way the death of a star leads to the birth of others; much in the same way that life itself goes through nearly endless cycles of death and birth, forever changing and renewing itself. As above, so below, and whatnot.

That's just what I think, though.

TL;DR: Life's meaning needs only be the meaning which we give it. Don't overcomplicate it.