Probably when i was around 11, but just accepted it some months ago (still closeted tho)
Btw, I'm 15 now, turning 16 in next month. almost 6 years of not accepting nnnn;
But I knew that I was different before tho.
My cousin and I used to play Karate or some kind of kung-fu **** when i was like 8 (he's 3-4 years older than me) and long story short: we ended up grinding on each others faces.
Someone from my family caught us and it was so ****ing weird. I said that we were playing some kind of police-thief game nnnnnnnnnn
Since then, I dont talk to him anymore