Sink or Swim?

I was listening to this song the other day and it really stuck to my brain
for a while in this annoyingly obsessive way. The chorus goes Are you gonna sink or swim?/
(something something)/Are you gonna lose or win? etc and it made me wonder:
if you have that sink/swim choice, and you're lost somewhere in the middle of a shark-infested-sea/ocean, and basically your choice is:
a) swim. hope to make it to somewhere, which by the way, is quite unlikely, and possibly be teared apart and eaten by sharks.
b) enjoy the little time you have left, make peace with yourself and let yourself sink, knowing you probably wouldn't have made it anywhere anyway. and then possibly be teared apart and eaten by sharks, but at least you probably won't feel anything.
what do you do?
how do you know whether you actually won or lost? and does it even matter?
is sinking comfortable, like in the movies? well?

The song
http://www.last.fm/music/The+Delgados/_/Sink+or+Swim

And there's a link to another question I always asked myself: how to escape from a sinking car. just in case.
http://www.wikihow.com/Escape-from-a-Sinking-Car