How to stop a door being opened without a lock

So i still live with my parents but they just installed a new door which doesn’t have a lock and my parents like to just barge into my room without knocking or anything and just in general have a total disregard for my privacy in general.

Does any of you have good advice on to kind of lock a door or prevent it from being opened without the door itself having an actual lock in it, which doesn’t require drilling …

door general knocking live lock parents privacy room