That is so weird. You are supposed to trust your parents and they are supposed to trust you.
My parents were pretty good at keeping my secrets, unless of course, it was guaranteed to blow up in my face. Then they did the parental mode override.
I was a pretty stupid kid so I did a whole bunch of dumb things and trusted that I'd never get caught. Inevitably I would get caught. Thankfully, my parents managed to at least soften some of the more dire consequences.