YOU SAID:

I am a kid and i missed out on my childhood

INTO JAPANESE

私は子供であり、子供時代を懐かしんだ

BACK INTO ENGLISH

I was a child and I missed my childhood

INTO JAPANESE

子供の頃は子供の頃を懐かしんでいた。

BACK INTO ENGLISH

I missed my childhood when I was a child.

INTO JAPANESE

子供の頃は子供の頃が懐かしかった。

BACK INTO ENGLISH

I missed my childhood when I was a child.