People who are really having a hard time in life can't even talk about it.
People who are really hurting in this world can't even share their problems with another person because it's too painful to talk about.
この場合、次のように言えます。
ーPeople who are really having a hard time in life can't even talk about it.
「人生に本当に困っている人はそのことを口にすることもできない」
can't even talk about it で「それを口にすることもできない」
ーPeople who are really hurting in this world can't even share their problems with another person because it's too painful to talk about.
「この世で本当に傷ついている人は、話すのが辛すぎて、他の人に問題をシェアすることもできない」
it's too painful to talk about で「辛すぎて話せない」
ご参考まで！
カナダ 
