1st or 2nd grade? We would have huge boys against girls tag games at recess, and finally one day the boys let me be on their team. They claimed it was because teams would have been uneven otherwise though, but I didn't care.
The first time I was referred to as male was about a year ago. I was at an art gallery, when an MtF (who became one of my closest friends soon after) came over to a mutual friend of ours and asked "What's his name?". I hadn't told him anything yet, so my friend corrected her, saying I was a girl, while I said nothing. Later that night I was talking to her and said "You were right, but he doesn't know yet." and I introduced my self as Kyle for the first time IRL.