While we are reminded to be urgent and diligent in our actions, we are also reminded to be forgiving of ourselves and not to worry.
There is a solution to the problem of suffering, individual concerns, and the question of death. The solution to all of these things is outlined in the Eightfold Path.
It is important not to waste our time in fruitless worry. Rather, it is far wiser to spend our time educating ourselves (from the experience of wise people from the past and the present), surround ourselves with fellow practitioners, and to make every effort in practicing the teachings that we find there that we believe.