“What is there to see in this vile body? He who sees Dhamma … sees me…” (Samyutta Nikaya, 22.87).
There seems to be is an inherent contradiction between Buddhist monks’/nuns’ needing a body in order to meditate enough to become enlightened but not wanting to be (re)born, have sex or children, have possessions, kill for food, fight in the military, etc. They need to be here (because humans have sufficient intellectual complexity to understand their existential predicament and how to fix it), but they don’t want to be here. They have to use humanity, in other words, to serve their purpose, but they don’t actually like/want human life very much.
The death of a loved one, or having serious health problems oneself, has a way of highlighting the pettiness and pointlessness of much of daily life. What things might survive death? Personal afterlife (liberation, redemption, salvation, etc., depending on your views) and personal legacy (e.g., children and their inheritence, one’s own tangible and intangible contributions to the world, maybe choosing to live/die in a location where one would like to be reborn, etc.) are the main things I can think of. Except as things pertain to either afterlife or legacy, most everything else seems like short-term issues about which one shouldn’t get too stressed or invested.
According to early-to-medieval Buddhism, as I understand, the self and (probably) world are like swarms/flocks of bees, birds, or fish: each particle more-or-less doing its part for some larger purpose with more-or-less thought, each particle itself a swarm of smaller particles — momentary configurations of some basic, common-to-everything, connected-but-separate flashes (not stable points) of energy, with the swarm’s complexity having slowly aggregated/evolved over billions of years. A feeling of a stable self emerges from the swarm, but it is an illusion. Swarms of food, water, air, thoughts from other people or objects, etc. are constantly affecting or replacing parts of oneself. These are several ways in which ancient Buddhism was/is similar to modern physics, biology, and complex adaptive system theories.
“All composite things are impermanent. Strive for liberation [from this state of existence] with diligence” (the Buddha’s final words, my translation from Pali).