When we were kids, we were asked a specific question that we probably felt we knew the answer to: "What do you want to be when you grow up?" Answers would run the gamut -- from firefighter to teacher to baseball player. It's understandable that we wouldn't know what our calling is at such a young age. Unfortunately, though, some of us -- even in our 20s, 40s, or 60s -- still haven't arrived at a concrete answer. It's well-documented that a lot of us switch majors multiple times in colleges and go on to receive a degree in something we might never use in the real world. While this isn't a big deal, it does become a problem when one opts to change careers several times after being in the working world for a considerable amount of time. Here are a couple of reasons why: It shows you can't make up your mind as to which career you wish to settle into People will start to think you can't hold down a job Your resume is proof that you have ...