Lyric discussion by ultralazer 

Cover art for No I Can't lyrics by Mountain Goats, The

I feel like this song is about someone addicted to amphetamines and has isolated themselves from either their lover or family. It sounds like they're basically living in an unfurnished apartment and unable to really take care of themselves. Perhaps the "you" in the song still has strong feelings for the addict so they bring them supplies, but can't be with them while they're still a drug user. It would make sense with the title of the song, "no I cant".