Alot of people complain about what they don't have, but don't appreciate what they do have. Why?

It's just human nature to desire things that we don't have. We are constantly trying to better ourselves, so we don't appreciate what we already have because we want to take things to the next level.

This is human nature.

Human beings are very selfish beings.

Cause humans are selfish and never satisfied. They always crave more.

just taking things for granted. focusing on the things they dont have an not focusing on the things they do have :)

You can't always get what you want,

But if you try sometime, you get what you need.

Sure.

Self ignorance, don't know much until its all gone.