Original

How a Chinese learn English?

Someone started their English learning journey was when they were five years old, even more smaller. And I started at thirteen. At the beginning, I thought English is an amazing language, I can express something in another way even I just know a little. The method we learn English is similar that begin with 26 letters, then words as "apple, banana", the last is sentence. At that times, I was deal seriously with every word and sentence. We have a lot of listening, reading and writting exercises, except speaking, so almost of us are dummy English speaker.

Altered

How does a  Chinese person learn English ?

Some started their English learning journey when they were five years old and even younger. I started at thirteen. In the beginning, I thought English was an amazing language. I can express something in another way even knowing just a little.

The method that we use to learn English begins with the alphabet and then words such as "apple and banana", then lastly sentences. During that time, I was studious in learning every word and sentence. We do a lot of listening, reading and writing exercises but not speaking so almost all of use are dummies when at speaking English.

Notes:

I am not sure what this sentence meant  I was deal seriously with every word and sentence

And with this sentence so almost of us are dummy English speaker.   I was not sure whether you meant that you could not carry on a converstion with an English speaker (dummy being taken as silent)

or whether you meant that your conversations were artificial.

Your use of punctuation is reasonably good. You do seem to have a problem with past, present and future tense (or I just misunderstood :-)   )

smaller refers to size,  you were talking about age so younger is the word that you needed.