GM is putting us in a universe where children are given a huge responsibility and power, despite inexperience. Sure, it's not really rational, but I would like to think this is about fun rather than rationality.

Besides, if this is anything like the aforementioned anime, we'll get our chance at dictating things soon enough...just gotta bear through the intro sequence. Change your perspective on everything that is upsetting you as a person to be upsetting to your character, and use it to fuel your story.