Giving up is never an option

Everything worth having is worth fighting for. If you want to be successful in any field, it is going to take hard work. Plain and simple. If you think that magically it is going to come to you; that you'll be discovered by the director of a major fashion magazine and they'll put you on the cover the following day, you're only fooling yourself. Even if, by chance, you met some important person who was also impressed by your first introduction, they wouldn't hand you success, you'd still have to work for it.
They might give you a small shot, like say, a little exposure from being in a small picture on page 96, but from there you'd have to still work hard. If you showed up late, didn't try very hard, etc, that would be your first and last shot. The same goes for any field. You have to apply and apply and audition and audition. You will get turned down. You will feel like success is unattainable at times. You will feel like an interview went great and you definitely got the job, only to never hear back from them. That's life. But during those times that you don't get the jobs, embrace it. Because it will make getting the next one even sweeter.
For instance, I do fit modeling work, which is during the production process of clothing. I try on the garments and we pin and cut and fit them perfectly to my body. Apparently, my parents genes worked out to be a perfectly proportionate size 4 body. I must have been on 6 or 7 castings for various designers from DKNY to Alexander Wang and everyone wanted someone with experience. I didn't really have much in that line of modeling, until finally I booked Catherine Malandrino. A huge client, who I'm still working for.  Now I will have a much easier time booking other fit clients because of the experience I am currently gaining.
Never give up. Giving up is not an option. You have to keep going, because eventually, you will see the fruits of your labor. Success is a ladder, not a human cannon. You have to climb your way up, because nobody is going to push, pull or throw you there if you won't take the necessary steps on your own.
Good Luck!
xoxo