A missed opportunity is exactly that nothing more or less. When you book a flight and you miss it you can never catch that flight again. You can receive a credit or reschedule the flight you missed but you will NEVER be able to catch that plan leaving that airport because it has taken flight.
Can you radio the captain and request him to turn around to come back and allow you to board the plane? I highly doubt it unless you are the POPE or the President. Life is the exact same way…you miss out on an opportunity more than likely it will never come again.
You can’t take a rain check on so many things in life but for some reason we want to believe that the world will stop for us until we are “ready”.