I have my first 5K on Saturday and I am a nervous wreck! I started running with the Princess Half as my ultimate goal over Mother's Day weekend, and thought the 5k would be a good short-term goal to work towards ... and I have worked hard and my running has gotten better.
Is it normal to feel THIS nervous??? I am only running to finish, and to maybe do better than my best time while training ... but am still putting so much pressure on myself.
Any suggestions (other than to just "chil" b/c that's just not happening ...
First off, some advice that I happened to overhear at a recent race - "You'll be fiiiiiiiiine." (And yes, he really drew it out like that. Took a good ten seconds to say it.)
Don't do anything new before the race. Eat the same stuff you normally would the night before, and morning of. Wear the same clothes you would wear for a run - even if there was a new shirt at the expo that you had to have, or you just got a new pair of shoes, a race is not the time to try them. (Disclaimer - I have not always done this. Do as I say, not as I do. Learn from my foolishness.

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Get to the starting area earlier than you think you would need to be there. Wander around, use the facilities, etc. At most races, people tend to (but not always) line themselves up at the start according to pace. Placing yourself in the starting area with people who will be going at about your pace will help you avoid going out too fast.
When you finish, don't just stop and flop down on the grass somewhere. While it is not as crucial for a 5k as it is for a half marathon (or a longer race), the worst thing you can do right after a race is stop moving altogether. Walk around for a few minutes - if they have water available, take some. Ditto for orange slices, bananas, bagels, whatever. After five or ten minutes, you can sit, but not right away.
Anecdote time - the Illinios marathon (and half marathon) ends up on the 50 yard line of Memorial Stadium at UIUC. A lot of people cross the finish line, walk until they have their medal, and then flop down in the first empty space they can find. And, after ten to twenty minutes, they sit back up. And struggle to stand, and then, once they are up, look around and realize that they have to climb stairs in order to leave. By contrast, the ones who walk around for a few minutes, but do not sit, can get up the stairs with relative ease.
I like to take a change of clothes for after the race. A simple change of clothes (even if it is just shirt, socks & shoes that get changed) can make a world of difference in how you feel.
Enjoy it. Have fun. It's automatically a PR. Enjoy that too. Just FYI - it's generally considered bad luck to wear the race shirt until you have finished the race.