Correction:

What are you doing?

Teacher had asked me of what I'm doing.  I answered, I'm learning Engilsh with teacher. She laughed and I asked why teacher is laughing. I was so embarrassed that I wanted to go out. It's finished.

Comment:
Hello, Harry! It's me, teacher Clariz. I was your teacher earlier. Did I really laugh at you? Maybe, I was just happy to  meet you. I don't mean to embarrass you. :D Thank you for today, Harry! See you around. ^^ - T. Clariz