Eh, I think it is just something to identify and work on.
I think that graduate school is a great time to identify traits/habits that interrupt productivity, and actively work to fix them. Everyone here is somewhere between undergrad and their second year; there is still plenty of time to work on how you handle stress, anticipation, uncertainty, etc. I think it's a bit soon to throw the baby out and conclude that research/science/academia isn't the field for any specific person here.
And this is coming from someone whose productivity has not been impeded whatsoever by the NSF GRFP. But I can understand that some people are simply more anxious, and some people might have more riding on this than I do.
(And somehow I completely screwed up the quotations in this comment!)