I'm think that this song's about coming out as gay.
Because
"There’s no way
This closet’s keeping me here" as in coming out of the closet
and "This confession was my only sin"
maybe he admitted to being gay and some people look at that as being a sin.
I'm think that this song's about coming out as gay. Because "There’s no way This closet’s keeping me here" as in coming out of the closet and "This confession was my only sin" maybe he admitted to being gay and some people look at that as being a sin.