waapa audition HELP!

Hey, I am 19 and have spent the last year training at the Conservatorium in classical voice. However I want to make the change into my true love - musical theatre and hence audition for a BA of Musical Theatre. However the only advice I can get from my parents etc, is that operetta and more operatic songs like "I hate men" in the words of my mother "show of my voice". Having a very high, big soprano voice - can I get away with singing Gilbert and Sullivan? I can sing pure MT but it tends to be the more operatic romantic lead stuff. Please Help me!