losing it tomorrow what I have today

I live constantly in the fear of not having tomorrow what I have today. This makes me hold on tightily to these things, not realizing soon I will be out of strength to hold on any longer. Will letting go be easy then? Probably not but then I would have no option but to let go. Losing it will cause all the more pain knowing how loyally I had held on to it. So why dont I just let go, start living in the present with never worrying about the future and trying to make it secure...Whats the fun of having a secure future when all the present goes waste in this insecurity...Is it worth it?
Dont know, dont know a lot of other things as well. But am trying hard to find out, and one day I shall. But I pray that its not too late then...