The Funeral

I sometimes wonder at the meaning of lyrics.  For instance Band of Horses' song The Funeral.

I'm coming up only to hold you under
And coming up only to show you're wrong
And to know you is hard; we wonder
To know you all wrong; we warn

One website says this song is about heroin.  And that makes a kind of sense.  But it also seems to articulate the human condition, which is also related to heroin use.  The sense of being "under" the strata everyone else exists at.  The effort to show everyone that indeed you can exist at their level.  The problem of ever truly knowing anyone or even yourself.

Then the chorus, "At every occasion I'll be ready for the funeral".  Does it mean that someone is unafraid of death?  Does it mean they are living on the edge?

And so it goes.