What if we had no borders or cultures ? How would our life be ?

It's impossible to not have any cultures. Culture is literally the way people live, their norms and values. It'd be impossible for everyone to live in the same manner, even if it's hypothetical.

Pathetic zombies doing the will of the elite.

Even without borders or cultures, we all have our own distinct personalities and character traits. So, what kind of person we were would depend on things like, our values, our beliefs, our priorities, our experiences, and also the kind of people in our lives, the support and love we receive and give out, and other factors like that which mold and shape us into who we are.

There will always be a culture. Culture is just the broad shape of everyone's viewpoint combined, so as long as people have viewpoints, they will have a culture.

And as long as people feel the need to start shit, and put locks on their doors, there will be borders.

Imagine there's no countries
It isn't hard to do
Nothing to kill or die for
And no religion too
Imagine all the people living life in peace.
You may say I'm a dreamer
But I'm not the only one
I hope some day you'll join us
And the world will be as one

Dictated

Guys, please answer his question. Of course it's impossible to have only one culture. That's not what he asked.