Does the government own your car cause you drive on public roads? It is possible to build on public land if pay the government land rent, the government doesn't

Does the government own your car cause you drive on public roads? It is possible to build on public land if pay the government land rent, the government doesn't own the building and isn't involved in funding. Also, international waters outside of the boundaries of countries aren't owned by anyone. They probably should be owned by UN to help with problems like overfishing.