I think I was the cause of a multi car accident but I didn't have any damage to mine
Why do you think it was your fault? What was the reason for the accidents?
I was near everyone when it happened. The people were speeding too much and didn't look properly.
That's great that you want to take responsibility, but since your car isn't damaged it's most likely not your fault. You need to keep practicing safe driving habits, because you don't want to end up in that pile up next time.
Whatever, I am still feeling good.
I'm glad you weren't involved in this accident, keep driving with that sense of awareness and don't speed. If there's no incriminating witnesses or camera footage, then it sounds like you were driving responsibly.