I need privacy!!!!!!?

[Jada]

I need more privacy!!!!!!?

I like to be in my room alot. Not cause I'm doing anything for real just cause I'm watching tv or on my phone or on my iPod watching YouTubes but I like to keep my door closed. 1. Cause theirs alot of noise and it distracts me from what I'm doing 2. Cause I feel better with my door closed and 3. Because I have a little sister and she comes in my room ALOT!! It just bugs me and I get yelled at for havin my door closed. And thu just busy in. They don't knock they don't do anything I even have a sign on my door. But they ignore it. But I get a whole lecture if I open the door without knocking. I can't even lock the door when I'm changing my clothes. What do I do??