Try not to take rejection personally; it's unfortunately just a part of the game, and there is always a strong element of chance. To show you what I mean, even though I have several fellowship awards on my CV, here are a list of some of my rejected applications: NSF GRFP (3x), NDSEG (2x), DOE CSGF (2x), Hertz Fellowship (1x), Schmidt Science Fellowship (1x).