How do I accept I am too old to join the US military?

I regret not working hard in sports when I was young, and it is one of the many major mistakes I made in life. I wanted to join special operations, but I am already in my mid 20s and not very fit. It takes years to get in shape from my current state, and the military wants people in their early 20s. I should have done more when I was young, but it’s too late now