I have a problem in checking grammar usage in my essay. Can somebody help me?

Here is my essay :

Talking about life changing event, I have ever encountered a question that has made me desperate. Although this question did not change my life at all, it has been a meaningful event for me. A question that has changed my point of view in living "What are you living for?”. I do not really know what I should answer. As long as I live, I have never done anything with my own enthusiasm. Everything I do is just because I am afraid of my parents. Though my parents have never forced me to become the best, I just assume it as my motivation to do the best.

At first, I feel very desperate. I cannot find any good reason to answer the question. I begin to think that I am worthless to live in this world. The world will be the same without me. I have no desired in doing anything. My academic performance is decreasing. When I am going to the third year of senior high school, I was drop out from the plus class and enter the regular class. My father then asked me “Where has my spirited daughter gone?” I have never imagined my father will ask this kind of question. I did not answer anything to my father. I am ashamed of myself for being a selfish person. I begin to realize that I have found my reason to live.

In my third year of senior high school, I become very enthusiastic to recover my marks. This time, I have my own purpose to live. I live for everyone. I will try to be useful for everybody so that I am not born to be merely a useless.

Please help me.
I need it asap.
Thank you for your time to read my essay
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I have underlined problem areas and stricken out inappropriate words:

Talking about life changing event, I have ever encountered a question that has made me desperate. Although this question did not change my life at all, it has been a meaningful event for me. A question that has changed my point of view in living "What are you living for?”. I do not really know what I should answer. As long as I live, I have never done anything with my own enthusiasm. Everything I do is just because I am afraid of my parents. Though my parents have never forced me to become the best, I just assume it as my motivation to do the best.

At first, I feel very desperate. I cannot find any good reason to answer the question. I begin to think that I am worthless to live in this world. The world will be the same without me. I have no desired in doing anything. My academic performance is decreasing. When I am going to the third year of senior high school, I was drop out from the plus class and enter the regular class. My father then asked me “Where has my spirited daughter gone?” I have never imagined my father will ask this kind of question. I did not answer anything to my father. I am ashamed of myself for being a selfish person. I begin to realize that I have found my reason to live.
In my third year of senior high school, I become very enthusiastic to recover my marks. This time, I have my own purpose to live. I live for everyone. I will try to be useful for everybody so that I am not born to be merely a useless.

Overall, a good presentation.
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Thank you very much.I'm really appreciate it.

Are the underlined words mean that i have to changed them?
Teachers: We supply a list of EFL job vacancies
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Yes.
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Thank you very much.
Now, i can improve my writing.
Thank you for your time.