I think that if you require that level of privacy then you should consider getting your own place. You can’t expect your parents to just let you do and have whatever you want in their home. Some parents can be overbearing but that’s the price you pay for their support.

If you’re a child then you need to understand that your parents are responsible for you legally and have every right to enter your room and go through your stuff. If that’s a problem for you then you should consider not doing stuff they might not approve of.

Also, you’re not a mental health professional and you cannot diagnose narcissistic traits. This is just you reaching for an excuse to justify your own lack of respect for the rules in your household.