Anya|Samandriel
I had the opposite problem, actually. My body's seventeen, but the rest of me is actually ancient. Which, I suppose is what happens when you wake up only to realize that angels are real and you happen to be one. It's a lot of hoping nobody asks too many questions.
I'm just grateful that only very few people can actually perceive my wings. It would make things a bit awkward.
I bet your exoskeleton is beautiful, though. Spiders are gorgeous, brilliant creatures if you take the time to appreciate them.