I'm pretty rattled and need some advice..?

I almost got in a car accident today and its playing with my mind. i was driving home from school and kind of zoning out. i got to a 4-way intersection and needed to make a left so i got into the left turn lane. i started to turn but then realized i didnt have a green arrow, it was just a green light. so i completely forgot to yield to oncoming traffic and before i knew it i was in the middle of the intersection, with cars coming at me at 50-60 mph. at this point my heart stopped and i saw two cars swerve around me and honk really loud. i ged it into my appropiate lane but then i was covered in cold sweat and shaking. that was the closest i'd ever come to death and it happened strikingly fast. at first i was just like "holy sh*t, i almost just died" but then i started to feel bad for the people i almost killed. like what could have happened if those cars didnt dodge me. they could be dead, i could be dead, we could both be dead or severly injured. im just really shaken right now. i didnt tell my parents because i didnt want to scare them, but i seriously dont ever feel like driving again. i feel bad that i screwed but like that. im typically a safe driver but i was so damn tired...anyway, does anyone have any helpful advice?