Do you personaly feel that you need professional help? Or that something yoru parents have stuck in your head?
Being transexual, gay, bi, or etc is not a fucking emotional or hormone imbalance. And the sooner your parents accept that fact, the sooner they can actually get to know you.
You are who you are, and if you try to be something else you only set yourself up for pain later on.
Now if you think you need help for other emotional reasons then go for it, but your sexuality is who you are, you cannot change this anymore than you can change your physiological sex.