Uhh,
you're getting into spirituality here.
That question: "why are we born unsatisfied in life?"
Is the main reason people go into religion.
Psychology doesn't give answers that satisfy the question and truly set it to rest.
This is the basic reason Buddhists look at the "way we usually do things" as unhelpful.
Being:
"If we have none, we want some. If we have some, we want more. If we have lots, we're afraid of loosing it!"
This is how "we usually do things" and is the cause of most of our suffering from a Buddhist perspective.
This is why the first of the Four Noble Truths is "Suffering is Exists, and is intrinsic to existance"
It is unavoidable. accepting that, we can move on to the cause and then the means to end it.
From our perspective, it is not the discomfort that is the problem/cause, but the avoidance of it and clinging to somthing else.
Be that ideas, ideals, wants, likes, dislikes, perceived rights, etc.
There is a saying "with the ideal, comes the actual".
Ideals are great, as goals, or visions of what we want or even destinations on a roadmap.
As a description of what actually IS. They are very lousy.
Ideals are sort of delusional, in that, they do not represent actual, current reality as it is right now.
Which is not a problem, accept when we start to insist that things are "unfair" or "should" be different.
It doesn't matter what we think they should be.
They are as they are.
And when we fight reality as it is presented to us, in our heads, we get: Frustration, Sadness, Anger, Delusion, Greed, etc.
We do it to ourselves.
This is why they say "all acceptance brings peace" or "all acceptance is the key to the gateless gate"
It is.
This is also why monks bow.
It's an act of acceptance.
This is also why I do not worry when people say things like "Transgendered people do not exist, it is a lifestyle choice"
No it isn't. That is reality. I know this because I have experienced it.
And sooner or later their energy for that kind of thing will run out, because it is: "Limited, mortal Human energy" vs. "Infinite Reality"
Infinity has all the time in the world! Humans die.
So I don't worry about whether or not they will succeed.
In the long run they can't. It just isn't possible.
This is also why I don't believe in evil.
In the long run "as things actually are" prevails.
I don't know if this helps or not.
But it was a philisophical/spiritual question so I gave you a philisophical/spiritual answer.
Love
-Sarah