BWD . . . I started out in computer science, changed to undecided, then to geology, then to kinesiology, then to English/Creative Writing.
I am a banker (at the moment) because I needed a job where my wife was going to graduate school. I graduated with an English degree. I was going to go to law school, but things changed . . .
Keep writing whatever you do. You will absolutely LOVE the creative writing classes. You will be around people that have different writing/reading/artistic tastes than you, but they will all have the same "way of thinking" (at least in the upper lever courses). Start the creative writing courses as soon as possible.
I actually took a creative writing course when I was an undecided major . . . just because I like writing. It ended up being one of the only A's I got that semester. The teacher also encouraged me to take another creative writing course. Eventually I just changed to that major.
Even though I don't have a job in writing, it is someting I still enjoy doing immensely. Just like writing/playing music.