What does "幸せじゃない大人に説得力あるものか" mean?


I'm not Japanese and I was chatting with my Japanese teenager niece in English
about her school life and bullying, and I said, "Don't worry, things will get
better".

She answered in Japanese with "Shiawase ja nai otona ni settoku ryoku aru mono
ka" (幸せじゃない大人に説得力あるものか).

What does that mean?

I'm a beginner in Japanese, so I don't really get what she said. Did she
criticize me or something? Some people started laughing... I'm so confused.

Thanks.




> "Shiawase ja nai otona ni settoku ryoku aru mono ka" (幸せじゃない大人に説得力あるものか).

With my poor trial, it could be said like " ~~ _Words are not persuasive said
by a not so happy adult like you!_~~ _It's impossible that what is said by an
unhappy adult like you is persuasive!_ "

She is somewhat criticizing you. I'm sure she knows you have not succeeded in
life or you are not so happy.

