Wow! I love that you are starting early and that’s in no way a bad thing. I would recommend dual enrollment courses, if available at your school. These are one of the best ways to show colleges you can handle their rigor and pace - and it’s a great GPA boost if you do. I would also recommend continuing those extracurriculars for your remaining high school years as it’s highly beneficial to pursue quality over quantity with regard to time commitment and level. Overall, I hope this helped and keep being competitive!