YOU SAID:

I’m stone cold inside, my heart is black.

INTO JAPANESE

私は中が石で冷たくて、私の心は黒い

BACK INTO ENGLISH

I'm cold with stone inside, my heart is black

INTO JAPANESE

私は中に石が入って寒い、私の心は黒い

BACK INTO ENGLISH

I'm cold with stones inside, my heart is black

INTO JAPANESE

私は中に石が入っていて寒いです、私の心は黒です

BACK INTO ENGLISH

I'm cold with stones inside, my heart is black