How to improve my writing?

Hey you, I'm Ring. And I'm from China. I am really confused and have no idea how to improve my writing. It seems I am just write essays like I am just only [1] a teenager, that's too bad [2]. Please give me some suggestions, thank you dear.

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[1] Writing "like I am just a teenager" is fine.  However, because you had already used the word 'just' in your sentence, I have suggested writing "like I am only a teenager."  These phrases have the same meaning.

[2] It would be better to write, "which is not good."

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The only time you have written like a teenager is when you used words like "wanna".  Otherwise, your writing has been fine.

Do you have a language partner?  If so, write a short essay about something you like.  Work together with your language partner to improve your essay word by word, and sentence by sentence.  You may need to rewrite the essay three or four times, improving it each time.  If the topic of your essay is something you like, it should not be too boring to practice this way.

Maybe you can try penpal which would help you write better in a more interesting and interactive way. It is dreary and hard to continue essay writing on your own in a long time. That is my conception.