Why do you think it is difficult? What particular areas do you struggle with? Are you taking formal English classes or are you trying to learn on your own? I notice that you are currently in Australia so you are surrounded by native English speakers. That means you are in a great position to learn the language.
All languages are, to a certain extent, hard to learn.
Note my correction to your title and your post. One word is rarely sufficient for a thread title. You have to put a question mark at the end of a question.
My guess is partly because your first language is Chinese. English and Chinese have little in common.
Which other language have you found easier to learn?
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