My parents found out when I was 14 cus the school found out and told them.
I made them think it was a phase I was going through and it was never bought up again until I was 19 and admitted to a psych ward. My CPN had to call them, ask them to come to the hospital and explain it all to them.
It was an awful way for them to have found out and I really wish I had been able to tell them myself. My poor parents.