Write about a time when you disagreed with a colleague or boss. How did you handle the situation?

I had some experiences after working in school, so I felt many hard emotions.
I had to choose my behavior whether I agreed or disagreed with someone.
It was so difficult for me, because = me because I believed that he was inccoret = incorrect.
That's why I tended to stand up to his order and talk about my thoughts.
As a result, I experienced some conflicts and felt frustration = frustrated in the past.
But now, I think that I wasn't wrong, because = wrong because I wanted to follow the truth.
Additionally, I learned an one lesson, which is that I need to be a more flexible person.
If I am silent in a bad situation, I don't act in a false manner.
It means that my silence can guard myself, when I faced = me when I face a troubled situation.
I try to remember that the most important person is only me, so I am be the center anytime.
This lesson is difficult until now, but I continuously remind myself about it.

Thank you for reading.
And I have a question. I don't know the difference ",whichi is / ,that is".
See you tomorrow !

OR
After working at a school, I had several experiences that made me feel many difficult emotions. I often had to decide how to behave, depending on whether I agreed or disagreed with someone. It was very difficult for me, especially when I believed that the other person was wrong. Because of that, I tended to stand up to their orders and express my own thoughts.

As a result, I experienced some conflicts and felt frustrated in the past. However, I now believe that I wasn’t wrong, because I was trying to stand by the truth.

In addition, I learned an important lesson — that I need to be a more flexible person. If I stay silent in a bad situation, it doesn’t mean I’m being false; rather, my silence can protect me when I face difficulties.

I also try to remember that the most important person is myself, and that I should always stay centered. This lesson is still difficult for me, but I keep reminding myself of it.