Summer programs/Internships

I'm a sophomore in high school and I'm 15 all the summer programs I see either cost so much or are for 16+ same goes with internships. I see people in my grade working for prestigious summer programs and I feel like I have nothing and no extra curricular activities. My interests academically revolve around math and similar fields and other than that I have a deep passion for helping underserved students academically or helping them gain confidence and being out there! It also seems that i get better grades than most people around me so it always stresses me out that I’m not falling behind because of my abilities but because I don’t have guidance for extra curricular activities. Please give me any suggestions about any summer programs or internships I could participate this summer or anything related! Preferably something that is mainly online/remote!!