People often turn down the chance to be interviewed because they're nervous, or afraid they'll say the wrong thing. Instead, think of the interview as a golden opportunity for you to convey your message. If perceptions about you, your school, or youth in general have been wrong in the past, this is your chance to set the record straight.
Remember that when you speak to a reporter, you're potentially speaking to an audience of hundreds or thousands of people. Try not to appear negative or confrontational. A hostile attitude will make it difficult for viewers to take your point seriously.