YOU SAID:

Being too smart is a problem

INTO JAPANESE

頭が良すぎることが問題です

BACK INTO ENGLISH

It is a matter that the head is too good

INTO JAPANESE

頭が良すぎるのは問題です

BACK INTO ENGLISH

It is a problem that my head is too good

INTO JAPANESE

私の頭が良すぎるのは問題です

BACK INTO ENGLISH

It is a problem that my head is too good