What is this myth about Helios? Well, there was a guy who wanted to get on the sun chariot, but eventually he died or something happened to him, but he got too close or something. What is the name of the boy, and what is the time period?

You are confusing Helios, the original Titan Greek sun god, with Phaethon, the son of Apollo (or maybe Helios) who insisted on driving the sun's chariot and couldn't control the horses so the earth burned and froze until Zeus killed him with a thunderbolt.