history: I was confident that I had aced my chemistry test in college In college I studied very hard for an upcoming exam that I was very interested in getting a very high score. I was confident that I did so. I'm sure you studied hard and should be proud of that! I'm positive you nailed it. I was very excited with my result. I am very competitive. Sometimes I wish I were not so competitive.
current: Being competitive isn't a bad thing unless you let it get in the way of your personal life. 
next: You are completely right. It is very important to not lose sight of what is important in life.