我是灯泡因为我会发光
[wŏ shì dēng pào yīn wéi wŏ huì fā guāng]
In Chinese culture, 'light bulb' is sometimes used to describe a person in an awkward position (such as the third wheel). However, this user seems to embrace it positively by implying that they have something to offer, like emitting light and bringing positivity.