How can i?

Hello, i am a highschool freshman wanting to attend the ivy league school, harvard. I am in 3 clubs, have excellent grade, and do volunteering and community service. But with all that, i am behind. Most freshman are ahead in the order or sequence of courses. Some taking geometry and biology algebra 2 and chemistry. While i am taking algebra 1 and physical science. I feel so behind and i really want to go to harvard but i know i probably won’t be able to go cause im not ahead like the others. What can i do to get ahead without leading to complete burn out, how can i compete with the ones that are ahead?