I know following rules is important, but it's not the end of the world, for sure. I can't even remember how many detentions I had (ditto my sister and brother) and we didn't turn out bad in the end.

I remember being more afraid of my parents knowing than the actual detention. It had mostly to do with my parents' strict rule about being home on time for dinner. Back in the late 1970s in PA we even had the choice of the paddle. We often chose that. It was even kinda funny! I know that's forbidden in most places, nowadays.