你发光但没照亮我
[nĭ fā guāng dàn méi zhào liàng wŏ]
This username can be interpreted as 'You Shine but You Don't Illuminate Me'. It suggests that even if someone shines, stands out or has remarkable qualities ('shining'), these attributes do not reach out or help/inspire/encourage/comfort('illuminate') the user in any meaningful way. An elegantly sad statement, expressing loneliness or feelings of insignificance