Why do I get soo nervous at track meets?

well I'm 10th grade and I've been in cross country and track for the last 2 years. So far I really like cross country cause of the long distance but I absolutely hate track. Unfortunately, I have to stay in track to stay in shape for cross country. Well I have a meet coming up in 3 weeks or so and I'm already nervous about it. Last year I did the 100 and 200m. But this year I'm going for the 400 and 800. I'm a good long distance runner but I hate doing the mile around the track. Just thinking about it makes me nervous, like Im so scared that I'll be in the back and be really slow. The most nerve racking part is the starting line, I hate it. (same in xc) any tips to get rid of my nerves?