Everyone above is right.
You are the customer / consumer / the guy paying the instructor.
Be constructively assertive about the situation - and you should be enjoying every bit of your flying.
If necessary - change flight school or flying club. Get your log-book signed off up to date.
Walk round preflight inspections are often lifesavers. DO NOT BE RUSHED.
Your instructor may have an eye on the overall day's schedule - the following lesson.
Did they say "Don't pay in advance"?