To me this song is like.
You know those abusive guys and husbands or even parents who llike.
Always want to be perfect proper like them. They want you to follow in thier foot steps cuz they are the right and holy ones. They try to put ideas in your head, and submit you to be like a sort of sait.
So the part that says something like " why does it have to be so lonely to be the only one who is lonely " is refering to like the result of the pressure so like you only have to be perfect, why everyone else including the person is like far from it.
The song she's had it and is like o b4 you like want to change me lookm in a mirror cuz ur just as bad and imperfect.