我非柠檬却比柠檬心酸
[wŏ fēi níng méng què bĭ níng méng xīn suān]
I am not a lemon, but I am more sour than a lemon. This username expresses a feeling of being as bitter or sad as if life gave one lemons, except it’s even worse because they are not just ordinary but especially heartrending.