Know of any good monologues?

I love acting, and w ill probably be auditioning for this acting conservator... and i need a monologue, I am 14 years old and blond (if that matters in choosing the monologue) I'm looking for more of a challenging monologue not one that is a trite comical piece. Also, one that is suitable for my age would be great (no younger than 13 and no older than 18) i would really really appreciate the help!!!! thanks so much!