YOU SAID:

I have been so cool in this school long time ago

INTO JAPANESE

私はずっと前からこの学校でとてもかっこよかった

BACK INTO ENGLISH

I've been very cool in this school for a long time.

INTO JAPANESE

私はこの学校で長い間とてもかっこよかった。

BACK INTO ENGLISH

I've been very cool at this school for a long time.

INTO JAPANESE

私はこの学校で長い間とてもかっこよかった。

BACK INTO ENGLISH

I've been very cool at this school for a long time.