I'm 18, and even when I had hair down to my butt, I got mistaken for a 12 year old boy. I've looked exactly the same since the 8th grade, almost 5 years ago. People often mistake me for my younger brother, or did when he was still smaller than me. I'm the shortest person in my family, aside from my nine year old sister, and even she is gaining on me quickly.
I never thought of it as anything related to AS, though, as both my brother and my sister have growth disorders that made my brother a year and a bit behind in growth and my sister 6 mos behind in growth. Keep in mind, that even with that, my sister is still only around 6 inches shorter than me.
I'm quite underweight and so I have no female figure to speak of. I have to shop in the little boys' section.
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Without the weird people, how could anyone define normal?