It is frustrating how decisions or lack of decisions in childhood can affect your adulthood

In my childhood, I never played sports. As a 23 year old, I can’t join the military without being laughed out because I don’t have the athletic background. I won’t be able to get a job in government due to poor performance in high school and college. It is just so frustrating because we don’t know better in childhood, yet decisions then affect us for the rest of our lives.