You are normal, at least in the respect that your experience mimics mine.
Running 50 mpw is fine for a marathon. You are correct that this mileage is not adequate to win a marathon, but it is more than enough to be a finisher. Running more than this mileage can increase the risk of injury, so stick to your current plan for your first marathon.
My legs give out before my lungs also. You will probably be able to pass the talk test (ability to talk and run at the same time) at all times during your marathon, even at the end when your legs are dead.
Recovery can be very quick. By the time you leave the finishers' chutes, you should be breathing normally and headed for the refreshment tables. You might have great difficulty getting into a car seat or a subway seat, but once seated, you should have no trouble thinking or laughing about the race with your fellow carpoolers or subway mates.
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