Let's start it this way. There's no one on earth that has not passed through any difficulties or is not passing through or will not pas through challenges, why? Because we are humans that have life in us and want to live, even a child just given birth to passes through a difficulty, he has to cry to show he is alive, so passing through these things means we are alive and working towards a certain goal. As we all know that there's season and reason for everything, you might be looking at a friend, coworker, classmate, successful businessman, successful writer, manager enjoying all the day long, going for clubbing, unending vacations, having best marks in class, having good things around them, they all have their stories to tell, there would be times they would want to give up, but they strived and it ended great for them. Who knows if you were given that promotion, it might lead to your death, or if you got all the praises your coworkers might plan to blackmail you.
Sometimes you would look at yourself and feel like screaming, sometimes you would feel like the things happening to you are too much for you, like it's about to swallow you, you'll be thinking in your mind that you're too young for what you're passing through. You'd feel like crushing that your boss who just sits in his office and orders you around without giving a damn, or that your coworker who gets praises from everybody in the office and you get blames and bad reports, you would look like a fool, like someone who isn't trying his best at work. 
You want to give up? 
Is it your ballet classes, your trainer is difficult, training is hard and stressful? push a little bit further, you're almost there, you can do it. You think there are more and better people than you, you are good yourself, you're someone's secret model, don't disappoint that person, just hang in there, all will be well. Don't be discouraged by things surrounding you, don't be distracted, stay focused, it's just the challenges time and when your own time comes, you'll be too happy to mourn, and remember, there's a supreme being up there looking at and after you, he's not asleep or has forgotten you, he's by your side, tap your strength from him and you'll be good.