You did a GREAT job! I can't believe you are in high school. Keep up the good work. Seriously, don't listen to lightguy, at all.
My ONLY criticism would be not to close off your vowels (like in "myyyy" or "wayyy".) I mean I understand the sound you are going to, and that definitely works for different styles, and it's cool that you are taking another step away from the "Broadway musical" sound, but I personally just feel like it would be better not to close them off and then hold them for so long.
But other than that, you really, really did a great job.
"You know, a little orphan girl once told me that the sun would come out tomorrow. Her adopted father was a powerful billionaire, so I supressed the urge to laugh in her face. But now, by gum, I think she might have been on to something!"
--Reefer Madness