“我心情很不好”翻译，要口语的~

I am depressed!
I am upset.
I am not so good.
I am not happy.
I am low-spirited.
I am in gloomy mood.

I'm in a bad mood.
I am down and out.
I am not having a very good day.
...

i'm in a bad mood
i feel bad/upset/annoyed
i'm not happy

I'm under the weather.我精神状态不佳，心情不好。

i am down.

这个是比较口语化的

I am not quite myself.