Do you have a passport and an adult to travel with?
I don't think you can leave the country without one. Or, at least the country you're trying to enter won't let you in without one. Legally anyway. Believe me, I know how bad it can be at your age, I wouldn't relive my teenager years if someone paid me to. But, it does get better and/or you can just leave at 18.
Not possible on your own
Human trafficking. You can become a world traveler.
There is no reason a 13 year old needs to get out o the country.