Your "ability to support yourself" is an illusion. Unless you own a farm, grow your own food, AND supply your own electricity, there are thousands of human beings supporting your survival. Without their servitude, you would die of exposure and/or starvation.

Many of those humans work for shit pay in places like Mexico, China, and Bangladesh. This is because they're lower on the socio-economic hierarchy than you, which is mostly because they were unfortunately born and live in the wrong nation.
The existence and functioning of this hierarchy depends wholly on continuous systematic violence. Without that violence, they stop sending you the food, electricity, or clothes you consume. You might still be able to acquire those goods and services without the hegemony, but it would cost you 5-10x what you are paying now.

This system of carefully organized hierarchy-based violence, we call "capitalism".