Sickness of life daily and constant sense of dissatisfaction is a kind of silent disease, never acute but which is always there, inside us. When the Buddha reached enlightenment, the first thing he said was the world is pain. This step is important, and the commitment he took was to free sentient beings from suffering. And people are sentient beings.
We feel pain, unlike rocks and minerals. And hearing implies feeling everything, the phenomena that we can perceive due to the fact that we are made as we are made, and above all to feel good and the bad, the pleasant and the suffering. If the human being did not feel suffering, he would feel nothing.
Buddhists call this the unsatisfactory character of life. Which is something more subtle, widespread, and continuous than normal suffering, which maybe has a very painful explosion and then passes.
Sickness of life generates anxiety
This long-lasting dissatisfaction generates anxiety for simple things, anxiety in every day only because our life is what it is nothing more. We are always missing something.
We lack social and work affirmation
A romantic relationship
The esteem of our friends
The courage to do
The wisdom of not making bad choices
We lack self-esteem
These are thoughts of a suffering person who is withdrawing more and more into himself, increasing his self-centeredness without realizing it. And egocentrism accentuates the sense of lack and therefore the unsatisfactory nature of life.
There is a problem with ourselves, with what we believe it to be. Every time we widen the boundary between ourselves and others, self-centeredness increases and with it the sense of dissatisfaction, hence the onset of chronic anxiety.
The boundary between ourselves and that of others is actually a boundary drawn like the one in geographical maps. If you physically go to that border you will not see any lines separating it.
There is nothing on the ground that makes it clear where one state begins and another begins, they share the same land, the same vegetation, the same grass. They share the same experience because it is the same land, it is a single land.
Borders are useful conventions, there are no such sharp borders in relationships between people. And self-centeredness creates the illusion of clear boundaries between us and others.