怪我太年轻是人是狗分不清
[guài wŏ tài nián qīng shì rén shì gŏu fēn bù qīng]
In a very colloquial and perhaps rebellious sense, this can be translated as 'Blame me too young, unable to distinguish man from dog.' The netizen likely intends to highlight a youthful period lacking experience or judgment in differentiating between honest and dishonest or good and bad elements in life.