I failed a history test in the 4th grade
Do you think you deserved to fail?
The teacher was stupid in the head to give me a bad grade
It might suck to fail a test. You should study hard so you can answer the questions accurately. You can't blame other people for your failures.
Maybe, but I don't give a shit. It was so long ago.
You can use the past as a learning opportunity for future tests. You cant blame others for how you did. If you need help studying you can ask for a tutor.