原谅我生性凉薄不会主动
[yuán liàng wŏ shēng xìng liáng bó bù huì zhŭ dòng]
This translates to, 'Forgive me for being inherently indifferent and not initiating action'. It expresses an apology for the user’s naturally reserved or aloof personality, which doesn't easily open up or take initiative in interactions.