I've got a similar problem Jenn except that my head, like the rest of me is small. Many adult helmets were just no use except the Bell "Bella". I think I must have tried on every make of helmet in the shop! It was the only one that fitted properly and was comfortable.

I've got the same problem with glasses. Because my face is small, adult frames are miles too big. My current pair are a very fashionable teens frame. Perfect fit