While I did static line rather than AFF (I'm old), I too was shit scared until my first self-supervised jump (i.e. first freefall). As in I seriously considered riding the plane down each time. I made 7 static lines (minimum of 5), and was more scared each time.
I went ahead and made the first freefall, and somehow relying on myself really cured it. I was a skydiver after that. When I'd made my first jump, I was given the choice between a certificate and a logbook, and I'd taken the logbook, but man I regretted it part of my student progression.
There's nothing wrong with deciding skydiving isn't for you. Absolutely nothing wrong. Even as a tunnel instructor. But I will say that my first freefall was a magic jump for me; it was about 45 years ago, and I still remember it distinctly.
So no advice, just parallel experience, and agreement with the other poster that no, you're not alone.
Wendy P.