Check My Descriptive Writing Please.

I have been learning English for 6 months. I think it is better to start writing paragraphs. Please help me check this one. This is the topic:

What was the subject that you disliked the most in high school? Why did you dislike it? How did you pass the exams?

Thank you very much.

Back in high school, the subject that I really hated was literature. I did not understand why others could write easily but I could not. Honestly, I really admired my friends because they always wrote long essays, and theirs all were full of feelings. When I look back now, I can figure out some reasons. First of all, I belonged to natural science. That was why I always got five scores for literature but maximum ones for math. The second reason was also the most critical factor that impacted negatively on my writing skill. I remember that I had to write unreal things in my essays. For instance, my teachers were not perfect but I had to describe them as angels. How could I write well when the lies always stopped my ideas? In my opinion, this was the worst teaching way because the teachers were killing students' self-expression and teaching their students how to tell lies. Fortunately, I was not good at writing, but I have never failed the exams because I always beat my brains out to finish my essays.