First notebook entry: Introducing myself

I want to learn English because it is a very beautiful and useful language. I would love to learnlanguages from all over the world.
I was born and grew up in Brasil until I was 17 years old and then I came to Japan to live and work in this country.
I work until 6 pm and desaffortunatelly unfortunately I dont have time to learn Japanese, but I hope that one day I can study Japanese to learn too because living here, it is necessary.
I have a son who is 7 years old that is studying Spanish because my son he was born in Peru when I lived there. Then when I arrive in my house I have to cook to for him and help him to make do his school lesson and for this reason I don't have time to study Japanese. I work on Saturdays too. Then on the Sunday I have to wash my clothes and clean the house and to go to the supermarket.

~ To say "I was born and grew up in Brasil" is not wrong, but it's more common to say "I was born and raised in Brasil". Also, in the sentence "I have a son who is 7 years old that is studying Spanish..." is not wrong, but it's easier to read if you write "I have a 7-year-old son who is studying Spanish..."

But, your English is very good!