To me this song describes someone finding acceptance in themselves and their imperfections, and realizing that they shouldn't dwell on the past and to let themselves go.
"and when i feel scared
i declare
i have everything i need
box up my bones
i'm free"
This part shows to me that the narrator wants to get rid of their regrets and their thoughts about what they could've had and let themselves realize that they have everything they need already.
To me this song describes someone finding acceptance in themselves and their imperfections, and realizing that they shouldn't dwell on the past and to let themselves go. "and when i feel scared i declare i have everything i need box up my bones i'm free" This part shows to me that the narrator wants to get rid of their regrets and their thoughts about what they could've had and let themselves realize that they have everything they need already.