I'm a pretty crappy singer myself, and don't listen to opera, but I came across this guy while searching wikipedia for voice types:
http://en.wikipedia.org/wiki/Michael_Maniaci
What a freaky dude!!! Apparently his larynx hardly changed at all during puberty, so he's the closest thing we have to a castrato today (sans the extra-close ball-cumcision 😲!!). He sings soprano parts in full voice, as opposed to countertenors who sing using their falsetto range. For an audio/video sample, go here:
http://en.wikipedia.org/wiki/Countertenor#Listen_and_compare
You can search YouTube for another clip of Michael discussing his voice (misplaced the link). He sounds like Julia Child! Lol 🙄