In the story 'Goliath,' what is real and what is not?

In 'Goliath,' the machines have taken control of humanity, and have built a fake world called the matrix that the humans are plugged into. Their bodies exist in the real world, but their minds exist in the virtual world of the matrix, which means that they live their lives completely unaware that the machines are in control. The machines do this to keep the humans docile, so that they can harvest them for energy in some manner. The narrator in the story comes to realize that the world as he knows it is not real. His life and his job are not real, and even the decade can change at the machines' will. He is pulled out into the real world, and experiences his real body for the first time. He pilots a ship and fights aliens, but is then trapped inside the craft. He asks to be plugged back into the matrix. He lives years in the twenty minutes he has left. These years are not real, but for the narrator this fake world is much more real than the actual one.