I was really nervous the first time I met with the doctor, and I'm nervous again about going to court for my name/gender change. Lots of people have anxiety and doubts. Once you see the doctor, note how it makes you feel. When I didn't get HRT on my first visit, my heart fell. I thought it would never happen, I thought maybe it was a mistake. That disappointment let me know I wanted it, despite all of my emotional gymnastics. It sounds like you're pretty certain about yourself, but not necessarily those around you. In the end, you'll find that you can't determine their outcomes, or even yours. You can just own your actions. Trust that in the end good things will come to you.
Erin