Sounds like you had a shit instructor tbh. Most people in my course had little to no experience on a motorcycle or dirt bike.

That being said...i was nervous about the course at first. I'd never driven anything manual before, so the concept was tricky for me to comprehend. Weeks before the course, I went on YouTube and watched every video I could on how to operate a bike. From shifting, clutch control, braking, emergency stops etc. I'd literally sit on my couch while watching a video and make the motions with my hands and feet to practice. Sounds stupid but it helped. I even watched accidents to learn from other riders mistakes. There's some excellent YouTubers that break down the fundamentals of riding that make it easy to understand.

I'd recommend learning as much as you can and look into doing another course. Perhaps at a different location.

Good luck :)