Imagine that a person you cared for told you what you just told us. What would you say to that person? And then say those things to yourself. Sometimes we have to be our own heroes and our own support-system. Can you seek professional help from someone? Is there a school-nurse you could contact? They are trained to help in situations like yours. You are living in a highly toxic environment. What your parents tell you is not true. Simple as that. Do your absolute best not to internalize it.