Can anything be done?

I am not sure where the original court order was entered. If it is either of your states, contact a lawyer in that state. If neither of you live...

What Do I Do To Get Out Of This Criminal Subpoena?

Get a lawyer. There is not enough information here. I do not know if it is a grand jury subpoena or a subpoena For court.

Call the hotline for child abuse in your state and report it.

What should I do legal wise to help me in court?

You should be appointed a lawyer. If not, then hire one.

My parental rights were terminated on September 13. How long do I have to appeal the decision And who files for it?

The usual rule is you have 30 days to appeal. Your 30 days are gone. Call a juvenile court lawyer to double check with your state.

Can i move in with a friends aunt if im getting verbal and mentally abused at age 17?

If you are truly being abused, call your child abuse hotline and report it.

What will happen to me ?

You were not arrested. It sounds like no criminal charges will be filed.

What is juvenile detention like?

I am sure you could find yourself in there easily enough if you are a minor so you could see upfront for yourself.

Can I be charged with certain things because I didn't go and talk to an investigator?

You should have a lawyer appointed to you or hire one.

How how can I get my custody back when his dad was already granted custody and his grandma has guardianship?

Yes, visitation needs to be court ordered.