On that note...if you do go the route of therapy, you can bring your parents in and tell them in a positive controlled environment where the therapist can steer the conversation and gauge the reactions for your greatest good.
It is not an easy journey. But, you know...maybe your parents will love and accept you as their daughter.
I myself am gender fluid, not really male nor female. There is no specific gender for what I am. My parents still call me her, she, their daughter. And it isn't who I am but haven't found the courage to tell them. Truthfully, I am more male than female.
How long must we hide who we are? It seems sad, to spend a life time hiding your true self, your true spark and inner beauty and everything you are. I think we came into this world so we could shine no matter what we identify as.