I haven't really heard this song completely, but it's been on a couple of tv shows over the past five years or so, that I've been forced to passively watch/listen to, so I'm a bit familiar with it. It's actually a really sad song which tells you the harsh, realistic truth about life - how no one will grieve when you die, no one wants to know what you're doing and no one wants to know where you bought your brand new sweater. Which is kind of the way life is, isn't it? If it isn't a whole lot worse than that. I think so anyway...
However, a great antidote to life's depressing aspects is - writing!
So I'd add a line to the song - 'No one notices your brand new sweater - but that's ok, if you write something good, cool or fun.'
If you don't write, let's say the same except 'but that's ok because you can always read a good book.' :)