Sophie,
I would suggest telling the therapist that there is something bothering you, but for now don't say what it is. Tell him it is something extremely hard for you to talk
about.You should then discuss confidentiality with him. If you find you trust him, tell him when you are ready. I am 60 now. When I was in my twenties I was busting to tell my secret to someone, so I told a college counselor in a letter. She was sympathetic and we met once after that. At that point, my male self was trying desperately to deny female me. When I met with her, I could barely look at her. I was scared, in denial, and afraid to ruin the male image I held onto for safety. Fast forward to me at 57. I spent all those years in miserable denial. The feelings never went away. All the times I tried to stick with 'him' finally proved to be wrong. I transitioned and am now happy. What I am trying to say is, find a way to face this, figure out what
your solution is. Your path could be very different. Find someone to help you form a plan. You will not always be with your parents. There are a lot of supportive people in the world. Don't feel bad that it is hard to get the words out to someone. The first steps are very hard, but keep working on it. Don't get down on yourself.
Moni