. I set out to change it and then
joint joined debate team.
During the first stimulationsDuring first practice sessions
but I stayed with it.but I didn't give up
I was shocked that my silence in all classes has been completely destructed
.... I feel this sentence does not deliver your idea very clearly. Your idea sounds vague and unclear to me. Also I suggest "disturbed" in place of "destructed"
When felt disappointed with the current university and even frustratedBeing disappointed and even frustrated with the current university, ...
Overall, with your essay, I see you have a problem with its flow...