I've completed a few 5k and a 10k run and have entered my first half marathon in May. In any race I've done I get really anxious about coming last, to a point where instead of concentrating on running and enjoying myself I want to constantly check over my shoulder to see if I'm last. The rational side of me knows it really doesn't matter and its about my personal best, but it spoils every run I enter into and prevents me entering others. I dread to think how I'll be for the half, when I know it'll be a callenge for me anyway. Any tips on how to overcome it and do others have the same feelings ( make me feel a little less silly about it!).