Hello english!

Hello.My name is Natsu.
Please correct.

I am writing about my pet.
I have a cat as a pet.She will be six years old next year. I want to do anything I can do for her because I love her. She may not be human but she is all in all to me. She got a short span of life  than me.

Hello english!

Hello.My name is Natsu.
Please correct.

I wrote about my pet.
I have a cat. as a pet  you don't need to say "as a pet." We can understand that without you saying it .She will be six years old next year.I want to do anything I can do,because I love her.She isn't human, but she is all in all everything to me.She is short lived than me. She will not live as long as me.

Hello English!

Hello. My name is Natsu.
Please correct.

I wrote about my pet.
I have a pet cat. She will be six years old next year. I want to do anything I can for her because I love her.  She isn't human, but she is everything to me.  She is short lived than me Her lifespan is shorter than mine. / She has a shorter lifespan than I (do).

Punctuation notes:  put two spaces after a period, one after a comma.  No comma before "because".  Capitalize proper nouns like English. 

Hello english!

Hello.My name is Natsu.
Please correct.

I wrote about my pet.
I have a pet cat.She will be six years old next year.I want to do everything I can for her because I love her.She isn't human, but I love her just as much and she has a shorter lifespan than me.