How close is too close?

I have never thought of my parents as my friends. They are my parents--sometimes friendly, parents who are friends with my friends' parents, but certainly not my friends. And although I often talk to my friend's moms, I have never thought of them as friends. So, when I was hanging out with a bunch of friends at my friends house, and she popped in the first season of Gilmore Girls, I was surprised to hear the mom whine to her daughter that they are "friends" and shouldn't they just tell each other everything about the boys in the Rory's life? I inwardly cringed. Though the show was actually pretty good, their relationship still really bothered me. I have nothing wrong with kids telling their parents about relationships, or school, but I have everything wrong with kids sharing every minute detail about their social life with their frighteningly eager parents. Truthfully, I have never seen this exchange occur, but when I talk to my friends about how little I tell my parents about my life, they seem shocked. I tell my parents whats important, because they are my parents, not my friends. With my friends, however, there is little left unsaid.