Don't worry too much, it sounds pretty normal for a trial flight. The idea of the first lesson is to give people a general feel of what it's like to fly, covering every point in detail would lead to information overload and put most people off flying altogether.
As your lessons progress your instructor will get a feel of how much you're able to handle, and each lesson will focus on a different aspect introducing things gradually until you're ready for that first solo.
It sounds as though you're really prepared and have gone along to your first lesson equipped with far more knowledge than the average student.
If you're not happy, try a different flying school or instructor, you'll know where you feel most comfortable.
Good luck.
