My writing teacher (My vocabulary is limited, could you help me polish it? Thank you!)

When I was a freshman in college, everything would pique my curiosity at that time. One day, as I was passing by a teacher's office, I noticed that there was a lefty writing rapidly.

Two days later, I audited his writing class. He walked into the classroom wearing a pair of slippers .

Slowly, he wrote that day's topic " My Career Aspirations" with his lovely handwriting on the blackboard.

Looking around the whole classroom, he suddenly smiled. " Who is that person?" he looked at me asking. I jumped from the chair nervously: " Sir, could I stay in your class ?"

Two weeks later, he sat beside me in the classroom checking the longest essay that I had ever written in college, which was only 500 words.

He kept writing on my paper and occasionally turned to the previous page and back. Thirty minutes ticked away. When he gave the paper back to me, I saw that there were a lot of interrogation marks, sentences rewritten and loads of better choices of words that he offered. On the last page, he had carefully written his feedback.

In his class, we watched movies and we wrote background stories. We played games and we learned that the biggest desert in this world is actually not the Sahara. He joked that he would kill for Nobel Peace Prize. He explained that to steal ideas from one person is plagiarism and to steal from many is research.

Two months later, I got an A for my final grade in his writing class. Two years have passed since then and  I am now embarking on a new journey in my writing class with the confidence that he gave me.

My writing teacher  (My vocabulary is limited, could you help me polish it? Thank you!)

I was a freshman in college. Everything would pique my curiosity at that time. One day, passing by a teachers' office, I noticed that there was a lefty writing so fast......
Two days later, I audited his writing class. He walked into the classroom wearing a pair of slippers . Slowly, he wrote that day's topic " My Career Aspirations" with his lovely handwriting on the blackboard. Looking around the whole classroom, he suddenly began to smile astutely. " Who is that guy ?" he looked at me asking. I hopped from the chair nervously: " Sir, could I stay in your class ?"
Two weeks later, he sat beside me in the classroom checking the longest essay that I had ever written in college, which was only 500 words. He kept writing on my paper and occasionally turned to the previous page and back. Thirty minutes ticked away. He gave the paper back to me. There were a lot of interrogation marks, sentences rewritten and loads of better choices of words that he offered. On the last page, his feedback was carefully written.
In his class, we watched movies and we wrote background stories. We played games and we learned that the biggest desert in this world is not Sahara. He said he would kill for Nobel Peace Prize. He said that to steal ideas from one person is plagiarism and to steal from many is research.
Two months later, I got an A for my final grade in his writing class. Two years passed, I embark on a new journey in my writing class with the confidence that he gave me.

The only mistakes I noticed were the extra spaces before the punctuation marks, but it turns out that the program you use to write Roman characters adds those automatically. This is very well written!