About myself .

I always have a big smile on my face. Whatever questions I meet, I always resolve them with smiles. Therefore, many people are willing to stay with me. So the top characteristic of me is that I am all smiles.
However, I am not doing quite well in my major, so sometimes I have a little low self-esteem and complain about myself. Why I am so failing? All through it, I believe ''Where there is a will, there is a way." That's nothing, and remember the most important thing is perserverance, So to repay my parents, I should be a hardworking student.

Put the punctuation right after the word, then leave a space. These are missing parts of spech or the incorrect form. In the second sentence, because you used the plural questions, the other words must also take the plural form. These are spelling errors.

"Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated failures. Persistence and determination alone are omnipotent." Calvin Coolidge, 30th President of the United States

About Myself . All words in a title must be capitalized.

I always have a big smile on my face. Whatever questions I met Whenever I face problems,  I always resolved it them with a smile. Therefore, many people are willing to be my friends. stay with me . So , the top characteristics of me is I am all smiles. My major asset is my smile.

However , I am not quite doing well in my major. So , sometimes , I have a little low self-esteem and complain whined about myself.  "Why I am I such a failure?" so faliing . Although it , I believe in ''Where there's is a will , there's is a way''. That's nothing , and remenber However, the most important thing is to perservere.  perserverance . So , I need to work harder to repay my parents I should be a hardworking student.

1.  you need to know your rules of punctuation spacing.  If you don't know, see

http://www.italki.com/knowledge/page/Mechanics%20Of%20The%20English%20Language.htm

If you don't understand, ask! :)

2.  It would be very useful to write in Chinese first and then translate into English.  This helps you to focus on your thoughts.