YOU SAID:

I can’t help falling onto a knife and killing myself

INTO JAPANESE

ナイフに落ちて自分を殺したりするのを助けることができない

BACK INTO ENGLISH

I can not help falling into the knife and killing myself

INTO JAPANESE

私はナイフに落ちて自分を殺すのを助けることはできない

BACK INTO ENGLISH

I can not help falling into the knife and killing myself