I'm pretty sure graphic designers get paid a decent amount, enough to make a living. At least, they get paid at least as much as my mom, according to a google search. And once you're settled in the field, there are probably ways to find related things you are interested in.
Also, I don't think you can be too young to think about college, but choosing a specific college then would be a bad idea. You don't know what scholarships you might be offered, how your life will change by the time high school ends, and also your interests can even change in four years. Although, it's still a nice idea to give it a thought or two. In the 8th grade is when I started really programming, and that has affected my college plans.