I think your answer was good. Maybe your friend should not have laughed. You can also say "My parents say I am stubborn" (ganko?) or "my parents say I am a good student." or "my parents think I am a good student. they are happy with me." or "my parents say I am too serious" ..... I am not sure if you want to say "stubborn" or "serious" or "hard-worker" or "good student" ..... but those are some choices you can say. I think your original answer was good though.... "my parents say I am serious"

New things

I want to learn many languages another English and Japanese. For example,French,Spanish,Russian,Chinese.........
At first, I have to master English.
But,I have started to learn French since yesterday.

I want to know many things,and understand.So, I wii do my best**

Thank you for reading.

I want to learn many languages, other than only English and Japanese.

 

-- good paragraph!

Very very busy

There is qualification of a pension adviser in Japan.
I am going to obtain qualification in March. :)
 
A pension adviser is a certifying examination which becomes the business with main acting as consultants, such as consultation, advice, instruction

 

I am going to obtain the qualification in March (**** use "the")

After passing the certifying exmainnation, a pension adviser can act as a consultant - giving consultation, advice, and instruction.

 

>>> It's a complicated thought. But good! - I think it's okay - but I made some suggestions for better grammar. Maybe some review of "a,an,the" rules might help. It's difficult - but keep practicing - the more you write and practice - the more your English will improve. I hope this helps.