If you refuse to quit, you must ultimately succeed. In 30 years of studying successful people, I have discovered one fact over and over. No one was ever defeated until they accepted defeat as a reality. No one can ever defeat you but yourself.
Yes. I am friends with a really smart group of people. Every time we have a test all of us worry our heads off that we're going to fail. I never see people worry about stuff like that. They just seem so confident.