Worry and doubt are our constant companions on this journey, at least at the beginning. Yes this is totally normal.
Someone once said, "Why worry about something if you can change it? And what is the point of worrying about something if you cann't change it?" So if the source of your worry is something you can change, get out there and change it. And if it is something that you can't change, do your best and then go with the flow.
Congratulations on getting your therapist's approval for HRT. Now make the time to go see the endo.