I also started coding very early and used my time choose a project and dive very deep into the full stack. Web technology is the easiest thing to “show off” to others since it’s ubiquitous and easy to distribute. Even if you consider yourself a “back end” type of person, learn some web dev to be able to show and tell.
This is a time in your life that you can work on a piece of software that’s just for fun and to learn and do something cool. If you are lucky and commercial, that project might become a job of its own that provides you a passive income. Otherwise, it’s a part of your portfolio to help you secure another opportunity. I routinely look to give part time/internship opportunities to folks in your position precisely because others may overlook your talents and passion to develop them and because I was one of them :)