I think I fractured my foot. And my parents won't bring me to a doctor what should I do?

Bring it up to them again, if they continue to ignore your pleas, ask a teacher if you are still in school to bring it up to a counselor, and seek guidance, this might be a case of child neglect, although they might not mean anything wrong with it, some families cannot afford medical expenses but there are programs that help families like this, but you need to get it checked