Secretly, I'm worried that I peaked in high school.
Why you believe you peaked in high school?
I was popular and played a lot of sports.
It may seem like you peaked, but you can still accomplish a lot of things. There's no sense in being concerned about what you used to do.
I'm done with school and sports. Highschool was the best time in my whole life.
It's great that you had a good high school experience, but focusing so much on the past is only going to limit your future. There are so many things left for you to do and accomplish. Don't put so much value on the past and focus your attention forward.