YOU SAID:

I'm hooked to onanism

INTO JAPANESE

私はオナニーに夢中します。

BACK INTO ENGLISH

I hooked on masturbation.

INTO JAPANESE

私はオナニーに夢中。

BACK INTO ENGLISH

I was hooked on masturbation.

INTO JAPANESE

私はオナニーに夢中だった。

BACK INTO ENGLISH

I was hooked on masturbation.