Mackenzie, there are transexuals who can't have HRT for a myriad of medical reasons. If your doctor is promising HRT prescriptions ahead of a full recommendation from a licensed therapist, he's a quack. More importantly, you don't seem to grasp the very serious nature of going on HRT. This is not popping tic-tacs. I think you have completely romanticized the process and reality will crush you.
See the therapist for several MONTHS. Come to understand what you are and what you need to do about it. You are headed for an epic fail.