I hate the waiting room too. I have been seeing T for several years and I have read every last magazine in there! So now I bring my own book which feels much better
I don't sign in or deal with anyone but T there regarding my payment.
If you write a check you could skip the receipt part of the routine and that might feel better to you.

The entering... It still bugs me. T opens the door, calls my name, I grab my stuff and head her way. She's smiling, holding the door. I smile but eye contact is quick. As I near the door she opens it all the way and stands with her back to the wall for me to pass through.
I used to tell her to go first because this made me so uncomfortable.
Now I go first, saying thank you as I pass her and go through the door for the short walk to her room. The entire time I feel very self-concious and anxious. When we get to the room and she closes that door, I feel fine.

We talked about how uncomfortable it feels, that time from my seat in the waiting room to my seat in the room. I love how she's interested, fascinated by everything

I still sometimes get to the room and laugh and say, I don't think that will ever get to be any less awkward and uncomfortable. What would make it better, she asks. I don't know yet. I keep trying to name what it is that creates the discomfort and awkwardness but I guess I'm not ready to see it yet.