我给自己套上了伪装我把内心穿上了盔甲
[wŏ jĭ zì jĭ tào shàng le wĕi zhuāng wŏ bă nèi xīn chuān shàng le kuī jiă]
Translated as 'I put on disguise for myself; I arm my heart with armor.' It illustrates someone putting up defense mechanisms and pretensions to hide their vulnerability and protect themselves from external emotional harm.