Affiliate Marketing Secrets

I’m about to start high school and I want to make the most out of it. I ask this question because I do not plan on playing ANY sports during high school. Will that ruin my chances of going to a good university?
I am thinking of joining clubs like Key club, Recycling club and this other club that does a lot of volunteer work and community service. My mum wants me to join a swim team but the swim team is not school affiliated. does this till count at an extra curricular? I’m trying for Stanford and University of Washington, but still I want to know what you think, will this hurt any of my chances for my future? all answers are appreciated, thank you!
I could play school soccer, but I dunno…