Modeling auditions are the stuff that legends are made of. Anyone who can make it through fourteen solid hours of people applying make-up, shaving vital areas, changing clothes, and fretting about how much weight they've gained since their last two modeling auditions is truly a soldier and deserves all the success they ever get.
Some people may say that the people you're likely to encounter at modeling auditions are brainless egomaniacs who think they are god's gift to the earth, but actually they are very brave and inspiring. When you spend your life going out on modeling auditions, you are constantly being evaluated, and constantly being presented with people who may be very much better looking and more talented than you are. If you can keep it up long enough to make a career out of it without going completely nuts, you're doing great.
When you think of your career, take it for granted that you are going to have to put up with a lot of challenges and difficulties, like marathon modeling auditions, for one. The point is to not focus on these things or let them bring you down because in fact they will only make you stronger. Modeling auditions will become less and less scary as you become more experienced.