Not that I disagree with the sentiment but you are veering close to the https://en.wikipedia.org/wiki/Liberal_paradox
You can buy a piece of land in bumfuck nowhere and try to live off it. Or you can join a community that tries to do that (more realistic). There's the whole https://en.wikipedia.org/wiki/Off-the-grid thing
Problem is that most people want the conveniences of modern, globalist life, and many people don't have a realistic choice.
Personally I try to find a balance between Buddhist non-attachment and making do with the life I got.
People want borders for exactly the same reasons you want a yard to do stuff in. You can direct that question right at yourself. Why do you want to have your own space? If someone comes along and tries to force you to give up your space, would you try to "get along" and just relinquish your space, or would you defend it? Why do you think you have more rights to that space than the other person? We don't tend to like it but there is no ultimate law in the universe that says that people can't acquire a space with violence.
You're asking questions about human nature that you yourself are equally subject to.
I do get the frustration. Best solution I can offer is just working on the level of the self. Like I said, non-attachment. Read some philosophy. Look into https://en.wikipedia.org/wiki/Nondualism (also https://www.youtube.com/playlist?list=PLKUeOXz8J87Q9qi-YfBfkT1KlKyhdKhrj). That was the only way I was able to finally come to increasing amount of acceptance of reality without losing my will to try to have at least small positive impacts on the world while I'm here. Actually I'm more effective at it because it helped me significantly reduce endlessly chasing after pointless dopamine fixes and trying to get "more" (https://en.wikipedia.org/wiki/Hedonic_treadmill).