Reading ''The fault of our stars'', John Green

Lately, I have been so focused on learning Japanese that I had forgotten that I had to practice my English. I had read some books to practice it and, in addition, I also learned a little bit more about American history. Now, I'm reading ''The fault in our stars'' by John Green. It tells the story of Hazel, a girl who has lung cancer in her lungs that and has to go to a sort of ''self-help group''.  She has to do this because her mother thinks that she has depression and going there may well help her.
She meets a boy who goes with one of the boys that goes to the group [<em>I don't understand this</em>] As I'm still only on the chapter one, I have just found out that this boy is begining to change the life of Hazel.
I don't know but this book is driving me mad!! It seems an interesting story and I'm going to  finish it as soon as I can. One of my friends told me the end is bad but I will have to see for myself to believe it!!
I'm going to take the advice of my English teachers who told my classmates and me, ''Never stop studying English even if you might have a document / certificate that approves you know English''.
I'm sure this is true and I always keep it in mind because learning languages is something that you have to do everyday!!

<em>Well done - interesting story.  Thanks. Avoid "gonna, gotta, wanna etc" in written English - it's too informal.  Remember capitals for names of languages.  Check my punctuation changes.  One can't separate phrases with commas - you need other punctuation.  Hope this helps, kind regards, Michael</em>

Reading ''The fault of our stars'', John Green

Lately I have been so focused on learning Japanese that I had forgotten that I had to practice my English. I had read some books to practice it and, in addition, I also learned a little bit more about American history.  Now, I'm reading ''The fault in our stars'' by John Green.  It tells the story of Hazel, a girl who has lung cancer, that has to go to a support group because her mother thinks that she has depression and going there may will help her.

She meets a boy who accompanies one of the boys that goes to the group, and since I'm only on chapter one, I just know that this boy is begining to change Hazel's life.  I don't know why, but this book is driving me mad!! It seems like an interesting story and I'm gonna finish it as soon as I can.  One of my friends told me the ending is bad, but I have to see it to believe it!!

I'm gonna take the advice of my English teachers told my partners and I, ''Never stop studying English even though you have the paper that proves you know it".   I'm sure they are right, and I always keep it in mind, because learning languages is something that you have to practice everyday!!

Intenté mantaner el primer párrafo parecido a lo que escribiste, pero me parece un poco extraño.  Aquí va otra opción que es un poco más coloquial:

Lately I have been so focused on learning Japanese that I forgot I need to also practice English. I had previously read some books to practice it, and I learned a little bit more about American history along the way.