I feel like this song could be about growing up, and then realizing that you want to remain a child. I think the first couple of verses are about being an adult and seeing the problems that people have that they never had as a child, and then remembering when they were younger and playing Bloody Mary. The "we'll stay" thing is pretty obvious with my interpretation - like he doesn't like being an adult and just wants the simplicity and simple thrills of childhood again.
I feel like this song could be about growing up, and then realizing that you want to remain a child. I think the first couple of verses are about being an adult and seeing the problems that people have that they never had as a child, and then remembering when they were younger and playing Bloody Mary. The "we'll stay" thing is pretty obvious with my interpretation - like he doesn't like being an adult and just wants the simplicity and simple thrills of childhood again.