Relax. The girls are
not broken; their pains and their traumas do not define them. Selebus, I think, is trying to portray the girls as truly human – on the outside, they look strong and confident, but on the inside, like all teenagers, they have their insecurities and their fears.
This is just the low part of their lives, when you start to approach rock bottom. By the time this game is completed and the purity routes are functioning, you'll be able to fully see how these girls all hit rock bottom yet persevered, coming out stronger than before (hopefully).
I mean, just look at Rin. She was suffering extreme depression a few updates ago, but she's [mostly] overcome getting rejected by Chika. Heck, she might even find new love considering that a mountainload of new girls will be introduced come January
Play this game as if it were an emotional rollercoaster. Laugh and cry; that's the point of this game
And check out Katawa Shoujo if you wanna play a free, completed game that's really similar to this...