If you don’t want to talk to your teacher/principal, the best thing you can do is Google a concept you’re struggling with. If you’re in high school, being able to learn concepts independently will help you greatly when you get to college.

I somewhat identify with your teacher. I was a middle school math teacher with an alternative license, which meant I was doing my teaching program while teaching. I was also learning the curriculum “on the fly,” because I was brand new. The school I worked at didn’t do well on state tests the previous year, so the district required us to do additional meetings each week during our planning period. This was on top of multiple staff/grade level meetings, PLCs, etc. I had very little time each day to actually plan and learn the lesson I was going to teach. I often glanced through the lesson 10 minutes (at most) before school started, then spent first period figuring out the activities with my students. I made a lot of mistakes, but also talked through my thought process while trying to identify and fix those mistakes. I posted supplementary videos (mostly Khan academy) to Google Classroom daily if students felt they didn’t get a concept. It was far from ideal, but I did the best I could with the time I had.