"The Girl Who Broke His Fingers" by D. M. Larson.
It is about a girl named Harmony who goes by the name Harm.
Read the monologue at:
Find more monologues at http://www.freedrama.net/small1.html
UPDATE: The play "Ghosts of Detention (aka the Wedgie Club)" is now available on Amazon.com:
The play contain this and other monologues for teen actors.