孤独已成性原谅我面无表情
[gū dú yĭ chéng xìng yuán liàng wŏ miàn wú biăo qíng]
It means ‘Solitude has become habitual, forgive me for having an expressionless face’. People using this likely feel that they are always alone, so much so that it’s affected their manner and facial expression.