>>215138610
The whole reason he's travelling the world is because he's trying to find out who he is. This has been a thing in comics since the 70's you have no idea what you're talking about. Finally the answer is revealed when some explorers uncover the fortress of solitude in the Arctic. From there he trains for some time with his father who also teaches him about Krypton. The crux of the story is him believing he's the only survivor of a dead planet only for Zod and crew showing up offering him a chance to rebuild Krypton and showing him they don't care about the human race.