It is absolutely true unless you are a forger.

Of course you can inherit money, find it on the street, have a rich friend who just gives you money. But unless you have a well and a farm, or rely on handouts, you need money to get water and food. And energy. The power company cuts you off if you don't pay the bill.

You say you work. Do you not get paid? The mechanism by which you get paid is all by people, and someone definitely authorizes your being paid (and ceasing the payment when they are not satisfied with your work).

Feel free to describe how you conjure up money without people being involved. (Forgery is valid as a workaround).

Social systems? I know i might talk to an US American, but most countries on the planet have one, besides US America.

But even US American get foodstamps right? Not all of them have to live in their cars?