Public toilets represent society. Many people in this society are squatting in this filthy place.
It is also possible to lose money by opening a shop, which makes you feel that there are too many dark sides in this society, which makes people sick. But you have to find a job, just like you have to go to the toilet (the toilet at school is more necessary for everyone).
You think stopping in this society is like stepping into a cesspit-"It's disgusting that someone sticks his leg into shit". And you want to squat, but you are afraid of maggots crawling on you, which may indicate that you are not fully prepared for your new job.
Maybe it's because I lost money in opening a shop and I'm in a bad mood, but I always have to face the difficulties brought by failure, and I can't shirk all the problems to the external environment. In this way, your view of society will gradually change from a toilet to a place suitable for you to live.