FYI: I'm IS.
In looking back at my childhood, I can say there where times when I probably showed signs, but I truly didn't know for sure until I was 14. See for me, and sometimes I still wonder if my Mom was aware that I was Intersex, because she raised both my brother and I in a mostly gender natural environment. And it's weird looking back, because there where a few times when she did not allow me to do something that girls would do, and I felt bummed about it but I really didn't understand why.
In about fifth or sixth grade, I started noticing that I was also different in a different way. This was around that time when I guess your suppose to start becoming attracted to other people. But for me, I was never attracted to ether boys or girls. I never had that reaction that boys are to have when they are attracted to someone (boy/girl). This was also the time, I started waking up in hell, if you know what I mean. I never understood why, but I hated waking up every morning, and thankfully it only lasted thirty seconds, but still it was hell for me.
And you know growing up, I really liked doing Mom stuff more than anything. I loved vacuuming, cooking, and baking the most. And a lot of the stuff my Mom and I did, would be considered more Mommy/Daughter than Mommy/Son stuff. We loved doing crafts. We even held hands in public, when we would go shopping, or walking around. We did this till I was about maybe fifteen or sixteen.
I kinda knew something was different too around ten. I remember I read this book about clothes from years past, and I remember reading that boys wore clothing that resembled clothing kind of like girls clothes. Skirts garments, and such. But I remember after that book, I wanted to wear girls clothes, but I never understood why.
And do you know what was so weird for me too? I really wasn't bullied that much at all. I mean, yes I was called names because I had Albinism, but no one ever went over name calling. In all the 15 years of schooling (Preschool, Kindergarden, and Sixth grade twice), I was never physically bullied. Even name calling died in middle school.
It was finally in high school, when I was able to put two and two together. It was a TV show about Transsexuals, and I finally kinda understood why I felt what I felt. So I assumed that's what I was. And so I went in the closet!