For most people life sucks and then you die.

Anyone can find happiness with their lot in life, no one truly understands why some of the worst experiences lewd to positive outcomes, but the typical result is misery.

As you age you have more experiences to compare reality to. Many of those experiences wouldn't be a recognizable experience to the other people that shared that time and space. We create our own reality in our minds that usually is shared in a comprehensive enough way to recognize and agree with, but each person's experience and interpretation of that shared experience is their own.

Whether crows are wonderful exciting and creature to behold, or dive bombing poop monsters waiting to target you is your own mind interpreting what you see.

These experiences shape how you look at the world and you repeat many of them in some ways reinforcing the held interpretation of it

Its a very easy to find pattern in historical records that older people(generationally) see the new world that has been shaped by younger people is harder to understand. And while some people do find this exciting and energizing, most people will find it a burden or a corruption of what they understand.

Things change. Viva mutator, non tolitur.(I don't know if this is a real quote but I always remember it from some fiction book I read that explained this translated "latin" phrase as life is changed, not ended)

How you can enjoy your life while living through some of the worst experiences or on going conditions is beyond my understanding, but you won't stop finding people that are amazingly happy in spite of this. Maybe a very small amount but you won't ever stop finding more if you put enough time in.