It wasn't just you. My parents knew all I had been up to before I even got home...
The "grapevine" was alive and well. We never knew where, we never knew how, but they always seemed to know.
But then again, they paid attention, too.
In my case, it didn't help matters that my father's sister .. my aunt .. worked in the lunchroom of my junior high school, and then she and my mother worked in the lunchroom/cafeteria of my senior high ...
It did teach me to be resourceful though ...