The Dalai Lama said:
“There are only two days a year when you can not do anything: one is called yesterday, the other is called tomorrow, so today is the right day to love, believe, do and, mainly, live.”
So there you have it, let’s get on with it!
And there are two ways to deal with unfulfilled ambitions. One is to use them as inspiration to push yourself to achieving your aims. The other is to consider that they may not be ambitions at all, but simply pipe-dreams to get you through the day.