YOU SAID:

i have decided that i want to die

INTO JAPANESE

私は死にたいと決心しました

BACK INTO ENGLISH

I made up my mind to die.

INTO JAPANESE

私は死ぬ決心をした。

BACK INTO ENGLISH

I resolved to die.

INTO JAPANESE

私は死ぬことを決心した。

BACK INTO ENGLISH

I resolved to die.