My irrefutable father

He complains nothing as a breadwinner  I don't know what you're trying to say.  What is "he complains nothing" all about?

who suffers a lot stresses.  Stress

When I encounter great difficulties  difficulty

in study and even want to give up it.He would say:"daughter,don't try to escape from reality ,you should and must act boldly and confidently.Only in this way can you find everything will be fine at last.  This is a little bit stiff and formal, but clear and grammatically correct, so good.

In addition,he is a father who shaped my distinct  ?? Wrong word.  "character" maybe?

 by encouragement and persistence.Everytime when he received my report card he never blames me but enourage me no matter how many scores i got.  "No matter what my marks were."  "scores" in sports.  "Marks" or "grades" in school.

He told me that honesty is the best policy .I Still many times I failed to pass my mathematics and it was he who offered me a shoulder to cry on.I will always remember one words that my father have said.Our greatest weakness lies in giving up ,the most certain way to success is always try just one more time.
Finally,if my father can understand English and sit in front of me .I am sure he will feel pride and smile .Many hugs to my father and thank him for what he have done for me.I love you dad!

Good stuff overall!