Structure

Personally, this sounds to me like he's singing to his younger self and current self. He's asking why he had to change, and why he had to bend and eventually be bent and broken by the world. This can be seen with the line "When the water turned to wine, did it feel the same?" This is showing the change from childhood (water) to adulthood (the ability to drink alcohol).

Additionally, there are these lines: "Feels like I've been here before Now there's an empty hole where you were long ago But things are different when you're young" These show that he remembers his childhood, and the child in him is the empty whole. He's singing to his child self "Now there's an empty hole where you were long ago" but then he realizes that everything is different when you're young.

Then you have these lines: "The nights are getting cold Those faces growing old And there is nothing you can do So sing your sad excuses You've got the scars to prove it And I'm sure they'll sing along" These are expressing the aging of himself and those from his childhood, and there's nothing you can do about growing up. He also seems to sing of how adulthood has left him with nothing but excuses and scars.

That's just what I think of this song. I've been listening to it on loop, and it just sort of seems like those moments people, even teenagers and young adults, will sometimes have when they remember the "structure" (See what I did there? Name of the song ties in too) of their childhood. Childhood was simple, plain, and structured. Adulthood can cause pain and will lead to longing for childhood. Childhood is water, adulthood is wine, and when you change from a child to an adult, you never feel the same. Of course, seeing as this is only my opinion, I could very well be wrong. Feel free to argue or agree.