That parents aren't always good people / always right.

I will be first to admit that i was a difficult kid sometimes, but later in my teenage years i really wanted to better myself. So i began to study hard and tried my best to be less of an annoying teenager. I actually got better grades in school and managed to behave better, but one teacher was just not going to let me pass the final exam (math, and i was always shit at math). So i began to study for about 10 hours/day but somehow did not manage to pass. I tried again and again but to no avail. My parents were furious at me and treated me like shit. I studied even harder until i hit my breaking point and started suffering panic attacks, couldn't sleep and was overall mentally wrecked.

When i failed for the 3rd time i filed a complaint which started an investigation towards the teacher and it turns out she was fucking me over all along, specifically making test papers in such a way so i had no chance of passing. I was immediately granted a pass on that exam.

My parents apologized to me but i never looked at them the same way again. They have seen how much work i put into it, they doubted me and called me a liar. I will never forgive that they did not support me when i was at my weakest.