What is privacy?

What you don't want others to know is privacy.
Don't think that the secrets your best friend whispers to you are private. Before I gained an omniscient perspective, I was very confused. I could hear some secret matters from so-called best friends—boring stuff about men and women, reactions in bed.
Later, I realized that best friends are the most unreliable. There is no true friendship among women. They only drag you into trouble and see you as inferior.