Hi, Paula,
How wonderful that you're seeing a therapist and coming to a better understanding of yourself. I hope I don't sound like I'm splitting hairs if I say that "doubts" is so broad that it can encompass anything from the healthy caution we should have before embarking on any physical and social change this dramatic to the serious reservations that probably mean that transition and hrt are not the best way to go at this time. You probably, too, have tried to distinguish between fears over what will happen from doubts about whether you truly want to spend your life as a women. Although fear and doubt might be similar, the distinction helped me discern what I truly wished to do
Still, when I started hrt seven months ago, I could not be %100 sure that I would respond physically and emotionally to it. I sincerely thought, given a lifetime of cross-sexual desire, that I would, but reality does not in every case match fantasy. Within a few days, I was feeling calm and sure of this route, and have not wavered since. Mentally, I am more authentic. Even though I haven't fully transitioned, my sense of physical and emotional being in the presence of other people is entirely female. It's wonderful to feel a part of this world. I denied it to myself until 43.
Best wishes to you.
Jane