Please translate

How do you write the following in Japanese writing:


"If you prefer to do so. I don't mind."

"It's so hard to believe in anything anymore."

- Moshi anata ga sou shitai no nara, watashi wa kamaimasen.
もしあなたがそうしたいのなら、私はかまいません。(If you want to do so, I have no problem with that/I don't mind.

- Mou nani mo shinjiraremasen.
もう何も信じられません。(I can no longer believe/trust anything.)
- Mou nani wo shinjitara ii noka wakarimasen.
もう何を信じたらいいのかわかりません。(I don't know any more what I am supposed to believe in/trust.)

All in polite speech, gender neutral, but assuming that a woman is speaking.