Very interesting. I’m an English listener so I hadn’t realised, but I suppose it’s a very literal song in Japanese? When I here English covers the language is actually very metaphorical. But I find the message beautiful either way.
So its miku who is not doing so well in school and always gets scalded by her mother when all she wants to do is draw and play games.She knows she isn't doing well so she scolds herself and degrades herself as well as school and then coming home to a mother who just wants her to do well you in school so she can have a bright future, but doesn't understand how hard it is for miku.