请以“I want to be a⼀an ......"为题写一篇短文

I want to be an doctor when I grow up. Last year，my mother get in troubles. She is ill and to see a doctor almost everyday. But she can't get better . When I see her cough day and night, I fell how pain she is! At that moment, I think，if I am a doctor ，she will not be so pain. I must be a doctor, go give people healthy! I know that, it is not easy to be a good doctor. I should study hard now, because I am just a student. I will try my best to be a good student first. And in the future I will be a best doctor.