Yes, life is unpredictable but, it isn't our oyster- as the saying goes. We can't achieve everything we put our minds to. We are naturally limited. Intellectually, physically, financially etc. We can of course, still work to overcome our natural deficits and some may do well despite the odds. Others who have most things going for them can still fail. But I suppose what is certain is- if you don't try, there's no hope of succeeding. But honestly- it irritates me when people say: 'You can be anything you want to be.'