请教英语达人（中文翻译成英语）。

Sometimes I can't understand whether on earth it is because I am not happy when I see the others buy something good or it is because the others are unhappy when they see I buy something good.

"Sometimes I do not understand that other people bought things in the end I watched a bad mood, or if I bought a bad mood looking at things other people?"

Sometimes I just understand why there is unhappiness, just because I see others buy good things or because others see that from me?

“I am not sometimes clear, is others buys the thing I to look is not feeling well, I buy thing others to look that is not feeling well?”