I know this is a hard sell, but dying one day is a good thing: it drives urgency to accomplish a lot in your life; you get meaning through having children and raising them vs. living just for yourself; and (for the religious) if there were something outside of this universe, it would let you go back.
http://yourmeaninginlife.com/blog/the-science-and-meaning-behind-limited-lifespans
You can always find a reason to complain, and you can always find a reason to be grateful. The former will lead to a miserable life; the latter will lead to a more pleasant life.
https://yourmeaninginlife.com/blog/it-will-always-be-something
There are many misconceptions about how important growth is to your life, from what kinds of growth are possible, whose growth is meaningful, and how growth is meaningful even in the face of endings and death.
https://yourmeaninginlife.com/blog/misconceptions-about-growth-oriented-meaning