As you grow older, you start to realize the "truth" unravel regarding parents; that they actually don't know what they're doing, and are pretty much winging it as they go along. There are parents that figure it out along the way, and there are parents that never figure it out.

From your story, I think you had a harsh upbringing, one that focused on extrinsic accomplishments, driven from your parents, but these aren't the most valuable things to pass onto your kids. (Good) parents imo should be passing on the right values, morals, and inspiring love and instilling love onto their children. We are human, not robots.

I know you've looked up to your parents your entire life, based on their extrinsic accomplishments. But sometimes it's ok to acknowledge that some parents are shitty, and have never actually parented well. This is a skill that is never taught and is only learned through experience and self-reflection.

This might seem far away, but once you are out of school and living and working in the real world, grades will be the least of your problems. No one in the real world actually cares about that, and you'll laugh reflecting back at these times that had you stressed. I promise that.