Far from it. But it does mean that all the satisfactions of any sort that we have for ourselves are in the present and that the present as it exists at any given moment cannot be perpetual. Of course, there is another side to this. The real is not merely rigorous and precarious. It is also often better than we think.
Imagination is sometimes morbid.
People allow themselves to be beset by fears that better understanding would soon prove slenderer or even groundless. You cannot live your life of ten years hence today. You cannot live your life of one year hence today. You cannot live your life of tomorrow today. But you can live today.