我姓吴却只能捂心口说爱你
[wŏ xìng wú què zhĭ néng wŭ xīn kŏu shuō ài nĭ]
It describes someone who, despite trying their best, feels inadequate in expressing their love properly ('Wu' also sounds like ‘wuu’, meaning ‘ohhh’) or hiding pain because it's impossible to fully articulate true sentiments.