Get an attorney. This is not a case that you want to plead guilty to and an attorney should be able to get this case dismissed.
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I was with you right up until you specified that you did this when "nobody" was around.
If you sat on a garbage can with your pants down just for the enjoyment of it when no one was around to even pretend to laugh or enjoy the sight of you being so hilariously outrageous, then perhaps consider a psychological evaluation as part of your defense.
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Get a lawyer yesterday. While this seems on its face to be a simple case, the long term possible ramifications are staggering and you are far to young to be labeled as a sex offender (yes, it is possible) with lifetime consequnces. Get a lawyer and keep your pants up in the future.