I understand where you are coming from. When I finally stopped denying that I was trans, I went crazy to from not understanding how to accept it. I really feel for you. However, there are no magic words. Believe me, I would have found them in the past if there were. All you can do is work on yourself and try to accept you for who you are. That takes a lot of effort and introspection. I realize you are afraid, but having a therapist to help you sort these emotions out CAN help. You need to accept this for yourself. There is nothing we can do to make that happen other than offer encouraging words or share our experiences. The acceptance has to come from you which is an internal battle that will require some work. I myself am still working on embracing the difficult dealing with fear and other issues.
Hang in there. I really wish I could say something and make you accept or handle these emotions. All I can tell you is that many have been there and have come out of this phase successfully.