YOU SAID:

I really can't stay baby its cold outside

INTO JAPANESE

私は本当に外に寒い

BACK INTO ENGLISH

I am really cold outside

INTO JAPANESE

私は本当に寒いです。

BACK INTO ENGLISH

I am really cold.

INTO JAPANESE

もちろん 元気よ

BACK INTO ENGLISH

I am. - Really.

INTO JAPANESE

もちろん 元気よ

BACK INTO ENGLISH

I am. - Really.