《跟自己有关的事》 就如同吃饭、上厕所那般，一定要由自己去做。如果你不做，谁会做呢？

《跟自己有关的事》
就如同吃饭、上厕所那般，一定要由自己去做。如果你不做，谁会做呢？
你不能不管

‘You’ must do it yourself if < it pertains to you>, Just like you would eat and go to the bathroom yourself.
If you don’t do it, who will? You should not ignore it.