I feel it is not true that there just cannot be another system. For a long time, there was such a system: homesteading. You could head out into an unclaimed area of land, stake out a piece, and live off it. It is quite recent that ALL land and capital has already been staked out, and that you have to live off the capital given to you by others if you perform chores for them.

However, you are probably right in saying that one shouldn't tortute oneself thinking about all this. It is unlikely my thoughts or feelings will change anything, and the only option left is to work hard to become a part of the system.