My parents think I am hiding things for being private is this normal ?

So just as I got older I wanted to be more private like just changing my password and closing the door of the room I am in or not letting them read my journal and my mother has gone through my phone although she didn't find anything as I don't have anything I need to be scared of but I am little anxious about people knowing me like I don't want them to know what music I listen to my wallpaper or that I am depressed they think I watch porn or some shit I don't just want to be more private they think I am talking to people when I am just searching things. One time my mother asked me about my journal what i write in it she said "do u write bad about me" like yeah but why do u care and can't you just improve I lied and said no. They think if I am private I am hiding.

Just asking is this normal or I overreacting or is it there fault or mine.