I hear of many people who aspire to being a game developer, plus professional athletes and rock starts nowadays. Be careful to have plan B, my friend.
Maybe even a plan C.
One thing you might want to consider if you like the Sciences is the medical field. There is some very good money to be made, it is rewarding and they can't fill all the openings in the nursing field, in particular nowadays. There is an actual nursing shortage. Also EMTs. Considering that all the baby boomers are aging and will need medical treatment, I do think that it could be a good way to earn a living.
But, if that is not for you, remember that computers are always changing and becoming more and more user friendly. The PC that I sit here typing at is light-years ahead of any computer that existed a decade ago and when I first started working about 30 years ago (gosh, I feel old saying that) a computer was massive and had to be housed in one huge room with special temperature control and security access. Special programmers had to work on them and it was considered highly complex. We treated those computer "geeks" like they were from some other planet.
Now, I can open up an Excel file on my computer and do what those guys took DAYS and WEEKS to do in about 5 minutes and figure out most of the commands on my own without an instruction manual. I am not very computer oriented, so if I can do this, I do wonder if someone is going to create a make your own game program next week and make all the game developers obsolete.
I'm pretty sure that won't be happening really soon, but just remember that with an education like that, there always comes the chance of becoming obsolete. So, be prepared. I think of how small things are as well, my i-pod has more memory in it than the first home coputer my family ever owned, true!
I would get all your required courses (I know, boring, but necessary) done in the first year or so and maybe take Business Management and minor in the computer things that interest you. A good background where you have an overview of the practicalities of running any business is very important. If you do work in the game developing field, having a grasp of how accounting, economics and marketing happen will be important.
Marketing that game you spend all the time on is essential, right?
Whatever you end up doing, I hope you are greatly successful! One day, I might have grandchildren and perhaps they will be playing game you create! That would be fun, but we will never know.
Also, seeing as I have two kids in college and know a bit about this stuff, it is not uncommon for most college students to change majors at least once during the college years, some two or three times. It's OK to be confused and expected.