Unless you get married or get early emancipation you can not move out. And you need their consent for marriage and since you live at home you do not qualify for early emancipation. So you just have to wait.
With parental consent or emancipation. Some states allow emancipation for fifteen year olds, and some do not. You will have to look up the laws of emancipation for your state. Without emancipation, you cannot sign a contract or own property.