People achieve success by consistently picking themselves up after every fall. They don't avoid failure. As Barack Obama puts it: "Making your mark on the world is hard. If it were easy, everybody would do it. But it's not. It takes patience, it takes commitment, and it comes with plenty of failure along the way. The real test is not whether you avoid this failure, because you won't. it's whether you let it harden or shame you into inaction, or whether you learn from it; whether you choose to persevere."
When you face an obstacle, try to get around it, and keep moving!