Every three or four days a week, i take my place alongside other bleary-eyed commuters on the eastbound Picadilly line heading into Central London.

I flick through the morning paper and wait for the inevitable announcement that begins with the words 'We apologise for the delay, but...'

But most days, i also think.

I think about how much more attractive people seem the moment they smile.
I think about whether my shoes are too red and whether they're sending out the right message about me.
I think about where I've been and where I'm headed (apart from eastbound on the Picadilly line)

Most of the time, however, my mind is occupied with one single recurring thought-

Is it worth it?