请英文达人帮我纠正这篇我自己写的文章里文法和句型,

题目

请英文达人帮我纠正这篇我自己写的文章里文法和句型,
If you could change your life,what would you want to do?And if you could achieve this goal,how would your life change?
I wouldn't want to go back into the past (mainly because I wouldn't want to relive that again) but I could change anything I would be my lack of confidence. I didn't have any confidence in myself. For example,When I read passages or answer questions in class,I am so nervous that I can't say a full sentence.After class,I speak fluently,but whenever teachers call me,I feel afraid.  The reason why I failed was that I lacked confidence.So I think that's what I would change.I want to be full of confidence any time.My life would be perfect if I had full of confidence.I think,maybe I can go to a great college.There can be no achievement without diligence and self-confidence.Of course,I like Soochow University now.

答案

If you could change your life, what would you want to do?And if you could achieve this goal, how would your life change?根据你的下文,建议修改为If you could change your life, what would you want to do ...