Being successful in mathematics depends on hard work or intelligence? I really need to ask this question. Perhaps my question is against the rules of the MSE. I am an IMO participant. I only joined once and I only managed to solve $2$ questions. ($14+1$ points).  I've never had a medal.  My teacher said I should join again. However, after seeing the students who collected $42$ points, I feel very poor. Maybe I will never be like them. I love mathematics. I enjoy solving the question. Teacher said that, if you work harder, you can win a medal. But I know this will upset me more.  That's why I want to stay away from math. I don't want to be a participant again. Really, this is a very sad situation. It feels so bad to know that I'm so inadequate. In the future, I want to choose a field that is not related to mathematics. I don't know what to do.  Maybe I wanted to relax a little bit by writing these. Thank you very much..
 A: Solving two questions in an IMO is pretty good! Yes, there will be people who do much better because they've trained extensively, but you shouldn't let it worry you. (There will also be a few people who do much better just by being brilliant, but you shouldn't let that worry you either. Unless you're Terry Tao, there's always going to be a few people like that now matter how far you go in math.)
If you enjoy the problems, that's the most important thing, and I would certainly keep going. The people who are going to be successful in math are those who enjoy doing it. And while it does need you to work hard, it's not the same sort of hard work that people do to train for IMOs, which is very specific to the types of problem that get devised for the IMO and is not really transferable to answering research questions that no-one else knows how to do.
It's also definitely true that comparing how much math people can do in 9 hours is not much like comparing how much they can do in 3 years.
A: I think the issue isn't maths, but competition. It isn't unusual to see youngsters in sport who love their sport but hate competing. They don't like the extra pressure, or the possibility of losing so take themselves away from the sport they love. The same is possibly true for you of maths, it's clearly something you enjoy doing, and should carry on doing. But that doesn't mean you should necessarily compete. Try taking some time off competing, still try the questions (if possible), but in your own time, at your own pace, and don't compare yourself to others. See how that goes, and whether or not it reignites your passion.
Edit:
As a side note, don't put down your own achievements. Qualifying in the first place, and collecting $15$ points is no mean feat. You are clearly talented, try and be proud of yourself.
