I agree with nearly all of what has been said above, but I would like to add that were it not for a particular schoolmaster at Ardingly College who understood former choristers (he was once Head Boy at Winchester) then I would have been expelled in my first term!
That master had been through it himself and could empathise (he then went to Rugby, thence to Trinity Cambridge, thence to Ardingly) and, of course, had seen dozens of former choristers pass through under him over the years (including some very notable adult musicians).
One has to accept, though, that the chorister life and usual secondary education in Public schools (not always before you all jump at me!) is very insular compared to 'real' life outside and unless one goes back into the music industry, one will ALWAYS have a piece of you missing (there will always be a corner of a cathedral that will be forever 'mine', so to paraphrase).
We were made fully aware of what was to come in our last year or term or so and perhaps today's so-called choir schools with their non-singing pupils helps no end towards the transition at 13, but still, it is the sacrifice one makes: after all, we're not castrati !!!!
(Avatar: detail from the Upper ten or Squirrels' Club by Walter Potter; a fine example of eccentric Victorian taxidermy, though the collection is now sadly broken up: