You can make an astral line to keep people out of your room. Instructions for making an astral line are at the bottom of the "Sermon:14/November/2015" linked below.
Sermon: 15/November/2015
You can also bind everyone in your family. Binding someone is different from cursing them. Someone who is bound is NOT doomed to die or suffer disaster. Someone who is bound is kept from harming you in any way. You can bind family members, teachers, and anyone else who could make your life miserable if they hated you for some reason. If they are bound, they will not harass you or otherwise try to harm you.
Binding Spell/Working
This does not mean bind your parents and then come out as a Satanist to them. Binding someone is not going to suddenly alter their personality to where they will drop christianity and embrace Satanism with you.