Nervous for my first XC race?

I just joined the Girls' XC team for my high school as a sophomore this year. I have never run before and I was incredibly nervous joining the team but now I really like it. I do a lot of other sports that keep me in shape and I have already noticed dramatic improvements within a week of practice. Last practice during 1000 meter thresholds, I timed 5:45 the first time and only 4:22 for the fourth repeat.

Our first meet is this week and I am so nervous. I am not worried about the distance because I know that if I am motivated I can run a stretch of a little over 4 miles. My issue comes with the hot weather and sun that is supposed to be out that day. I am very weak against heat and easily get light headed and nauseous. Just walking in hot temperatures makes me feel really sick. I know this is going to impact my performance a lot for the meet but I don't want to be embarrassed by doing bad in the weather. Please any advice would be super appreciated!
Nervous for my first XC race?
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