>>5
In that case, why don´t you ask your parents again to go to a public highschool? . Be clear about your feelings with them, and tell them that if not,you may want to leave school. I think they will understand. Many times we imagine situations that end up being much easier than we thought :)
At the public school,you may feel better and find new people with different ideas and backgrounds. So maybe the problem is just staying away from the rich world at least for a while. When you finish, you will be able to do whatever you want!.
And if you like helping and taking care of people, you may also find a suitable career for you like nursing or psychology, or many others.
Good luck!! :)