Maybe they kept calling because you were 17 and they were your parents and legally responsible. And they just might have loved you and were worried about you. Unless someone goes in the military it is not the norm for a 17 year old to move 300 miles away!
I understand talking every day but 3-6 calls per day nagging about every single minute of my day and what I ate gets ridiculous after several years.
Picture me working on a nuclear plant and my mother nagging me why I didn't eat enough special organic honey this month. She even called my boss several times when I was too busy to listen to her nag about such trivial nonsense.
It was so much that it made me afraid of becoming a parent.