In US, a minor (anyone under 18) cannot legally leave home without parental consent unless they have been legally emancipated in some way (court decree, marriage, etc).
Running away is not legal in any state. In that case you could just move out.
No but you could most likely get away with it.
Yes
yes it is
yes
Only dating isn't illegal anywhere.
NO! you definitely should not date someone that old at that age
no. you can work away!
both
No, the legal age of consent in Missouri is 17. Therefore, it would not be legal for a sixteen-year-old girl and a fifteen-year-old boy to have consensual sex in Missouri.
Yes, the 16 year old is a minor and you are an adult at 18. It is illegal.
That is up to your parents to decide. There are no laws for dating. You are too young for sex. The 13yo have to be 16 for it to be legal.