You sound pretty competitive to me! This is what I am hearing from what you wrote,
- AP Calc BC and AP Physics as a junior
- strong test scores
- As in 10th/11th grades
- STEM ECs + rock climbing and painting
Keep doing what you enjoy! Just make sure you keep up with the math and science courses in 12th grade. (Sometimes accelerated students run out of classes to take in HS.) What math and science do you plan to take next year?