Susan, I changed my major seven times in college. I got my degree and have a successful career unrelated to it. Although it is important to do well in your studies, they are not the end-all, be-all for your future. What they do absolutely show is your capacity to learn something new. In many industries today, there are procedures, databases, processes, systems that are unique to the company themselves and if you show a propensity to excel in learning in school/college, then that shows you can learn what they need to teach you fast and efficiently. You will hear "Do what you love and you won't work a day in your life" and that is true to an extent. Do something that you ENJOY, something in your soul you are passionate about and you will be a better employee and person for it. Good luck in whatever you choose!