In 4th grade I read an article about a kid that made his own board game and had it produced and sold. That day I made a board game, and wanted to make a game of my own ever since.
In 8th grade I decided I wanted to be a teacher.
I hated school, but revered some teachers in my school for being different and treating students different, with respect, empathy, and value.
I knew I wanted to do the same, and thought as much at the time.
So I did so.
I am a college grad, with an education degree. I have taught for years.
Here I am then, both passions alive and well. I am a teacher, who has changed the trajectory of hundreds of students being an honorable teacher, and with hundreds of dollars in unique board games I've collected, I've designed several (none marketed), and Im hacking away at an RPG here as well.
The advice here is by no means "wrong". You do indeed have time, many things can change, you have a lot to do, much to experience, and even more to suffer. These things will have an impact on you.
So, I agree in part. "Slow Down", learn to know yourself. Learn to perceive the difference between a like and a passion, an interest, and a thirst. There are tens of thousands boys that want to make video games, because they are interesting. (Recent polls for your age bracket show computer programming / game designer is actually #1 for boys). Out of them, less have a passion for it. Discover the difference in yourself.
I also disagree. Becoming a teacher was no interest for me. It was a passion. It was not what I thought I wanted, its what I knew I wanted. Its what I wanted to become, and do ... I had a thirst to make a positive difference in the lives of students, the same way some teachers of mine impacted me. So I knew, I decided, in 8th grade ... and no amount of life, or events, or experiences, or growth could change that passion. So, inversely, if it truly is, what you want to live your life and die doing, and you know that now, do not, slow down.
No matter what you decide, "If your job is what you love, you will never work a day in your life." That's one of the few clichés that's real. Do not choose something for money, or for an easy degree to attain, just to get a job. You'll be miserable beyond words. (Except if your shallow enough that you love money, then you wont care what your doing so long as you make as much money as you crave. You wont be miserable, but you will be hollow.)
As far as the technical aspects of schools, study and what you should major in, Ryexander clearly gave the best advise regarding the actual strategic nuts and bolts behind fleshing out a major/degree and etc. That's nothing but good tactics there.
All the best to you.
MeVII