YOU SAID:

my sister thinks im stupid and ill never get 115 likes :(

INTO JAPANESE

私の妹は私のことを馬鹿だと思っています。

BACK INTO ENGLISH

I think my sister is stupid to me.

INTO JAPANESE

私の妹は私に愚かだと思います。

BACK INTO ENGLISH

My sister think I'm stupid.

INTO JAPANESE

私の妹は、私は愚かだと思います。

BACK INTO ENGLISH

I think my sister is stupid.

INTO JAPANESE

私の妹は愚かだと思います。

BACK INTO ENGLISH

I think my sister is stupid.