In my book - It's Time Now, Choose the Life you Really Want, I talk about the fact that we have limited time on this earth, that we need to ensure we are living a life of our choosing, not the life someone else has chosen for us. The bottom line of course is that we all only get one life to live. It makes sense that's it's the life we want for ourselves.
I recently came across a Commencement speech that Steve Jobs delivered to the graduating class of Stanford University in June, 2005, in which he shared three stories with the students. In particular, hang in for the third story - as always, Steve Jobs says it so much better than I ever could... check it out here.