我是人年轻人心情不太好
[wŏ shì rén nián qīng rén xīn qíng bù tài hăo]
It translates directly to 'I am a young man whose mood is not good today'. Simply stating their young age and not-so-positive feeling. May imply youthfulness associated struggles or moods, a certain sense of restlessness, dissatisfaction with current status or daily grumbles of a young adult.