Sorry to hear about what you are going through.
Check your own country laws for being adult. In most countries is 18, so you might have less time suffering.
If what you are going through is life threatening, go to the police, you don’t have very much to lose. If it isn’t life threatening, try to make the best of your life until adulthood. Making some friends in school or neighborhood will help, even if it might be not very easy.
Once you are adult, you just need your passport and a plane ticket.