Honestly I feel you might be going about this all wrong. I mean, don't study in digital arts if you're not into that just because it might allow you to be a game dev on the side. And then, what, you'll sink hours into getting good at something you're not really into, and then you'll spend like 75% of your time doing art you're not really into for other people just so you might maybe spend a 10-15% of your time on stuff you actually like? Don't you think you'll feel miserable before long?
Seriously being a one-man game studio is an insane amount of work, will require a crazy variety of skills and will likely not allow you to live off of it. I mean, hell, any of the stuff that needs doing in a game studio is a career into itself and requires years of intensive training: music, art, coding, design, marketing, you name it. It might be fine as a hobby, on a personal level, but I personally don't believe in it on a professional one.
So, the way I see it, you really have two options:
1) If you really want to be part of the gaming industry, pick the part that you like best and concentrate on that. Being a "game dev" is super large, what part actually interests you? What part are you actually good at? And then maybe after hours you can develop your own personal projects. Or you might manage to be part of a studio that allows you to develop your own projects, or a small enough team that it allows you to actually have a word in the design process. But from my experience getting a masters in music, those that studied music because they wanted to achieve something that was not the music itself (i.e. become a star, or become rich, or whatever) didn't last long. So if you go into digital arts because you want to design games, well I'm willing to bet you won't last because you'll get fed up with the actual art quickly enough.
Also by the way game design is an actual thing, in some schools anyway, but (wanna-be) designers are plenty and the actual jobs are very few. Now I'm not saying you have no chance of succeeding, but I'm saying it's hard and the chances of you not making it are kinda high. It's like how they say on here: everybody has the-best-idea-ever, what is often needed is not people to supply ideas, but people to actually create something out of those ideas. The designer is the idea guy, so unless you are exceptionally awesome at it and incredibly well connected, chances are that you will have to build your own studio from scratch to be that guy in a studio. And well, that's a whole other can of worms.
Besides, my personal opinion is that the philosophy that says something along the lines of "make your passion your job and you won't have to work a single day of your life", this idea that we all grew up with, is bull****. A job is a job, whether it is your passion or not. There will always be hard or boring parts to it, you will always have to do stuff that are technically within the general field of your passion but you are not actually passionate about just for the paycheck. And then when you actually have some free time to indulge your passion, you might very well feel like you've done that all day and you'd feel like doing something else instead. That was my experience anyway, I barely play music at all anymore. So this leads me to what is in my opinion your second option:
2) Just do whatever you won't hate yourself over to live off of something and indulge your actual passion on your free time. Indulge your passion how you want it, on your own terms, and have the means to really indulge it, rather then use it to try and scrounge a meal ticket out of it. I'm not saying to drop college or anything and just get the first job that'll have you, of course. The point is not being miserable. But pick something you're good at and that you kinda like, vary your activities. If it's digital arts, cool. But it might as well be, I don't know, accounting or something.
So really, if I were you, I'd assess my life goals and evaluate what is the best way to achieve them. Where do you see yourself in 10 years? What level of comfort are you aiming for? Do you eventually want to raise a family of your own? etc.
But yeah, I'm aware that if I'd told 19 years old me what I just told you, I probably wouldn't have listened to it. I could've become an engineer, a coder or any kind of scientist or doctor, I had the means to, but I just had to do music. Anything else wouldn't have fulfilled me. And even if I gave up on it eventually, I don't have any regrets. I'm glad I went all the way and reached my limit. It was a great experience and it taught me a lot. Otherwise I'd have lingered on it my whole life, asking myself "what if". Now I know "what if" and I'm much happier and more at peace. So go ahead, live your passion! Or don't. But assume your choices and be aware of the consequences.
Also your age is the age if there ever is one to try stuff out and change your mind, so don't worry too much about switching curriculums. You don't have to get it right on your first pick. Barely anyone gets it right right away like that.