So Happy~

I am so proud that my Chinese article(writing?s?) has won the first prize in my association(Is the usage of this word right?).

I am so ambitious that I want to be one of the best writers. This is my dream.
Jia You!!

Using either of the words article or writing would probably be okay. Normally the word article is used for writing that is intended to be published, but we would probably use the word essay. An association is any grouping of people, but usually only a voluntary group.

Congratulations!