I'm embarassed of everything I do on my phone whether ordinary or not. Whenever I feel someone looking at my screen I turn my phone off. Whenever my mom walks past my room (I hear her footsteps but she doesn't go in), I close my laptop or hide my phone.
It's because as a kid, my mom did a bunch of shit to destroy my perception of privacy.
She bought me a diary for my 9th birthday, then used the stuff I wrote in it against me.
She would look through my search history and jokingly mock me for looking up a girls facebook.
She forced me to give her my facebook login, and she'd post from my account and sometimes even respond to my friends messages.
Since I don't take pictures of myself, she'd "hire" my cousin to secretly take pictures of me and send them to her.
She would listen in on any phonecall I'd have and then as I hung up she'd always ask "Who was that".
Today none of my phonecalls last more than 30s, I speak very quietly on them, and give short and blunt answers until the other person hangs up as I have an intense feeling that someone is listening in on me.