Logic Riddles

Question: I'm simple for a few people But hard for them to hear I live inside of secrets I bring people's worst fears What am I?

Question: I'm priceless, and cannot be bought, Some seek my purpose, Others destroy me, Those who steal me gain no more, I never last forever, but can a life-time. What am I?

Question: A girl dove in the sea.. some say there are two people under the sea. Why is that?

Question: A girl dived in the sea.. some say there are two humans under the sea. Why is that?

Question: 2 men and a boy started a never ending race. One of the men can run super fast while the other man can run way faster than the boy. The boy is the slowest runner. What are they?