@JelsaNoir Hey, congrats on working up the courage to try out. That in and of itself is a BIG win!
1) Don't stress out about it. Think about all the reasons you want to be drum major. Are any of them fun? Are any of them connected to joy? To enjoying the experience? If so, then focus on those reasons. Don't get hung up on being perfect or beating other people. Make sure that you really want to be drum major for the great experience and fun it will be.
2) Don't underestimate the challenge. It's a lot of hard work to get ready for a drum major audition. Be prepared! Put in as much work as you can ahead of time. Know the audition requirements front and backward! Don't worry about being perfect, but focus on being confident in the material.
3) Know that as a Freshman, there might be other candidates who are more seasoned and experienced than you that might be a better fit just because they are older. Even if you feel like you're the best fit. If that happens, respect and honor them! As a freshman, you have several more years to try out!
4) Did I say have fun? Just have fun! remember we can't always get what we want in life, but we should always be ready to enjoy the ride. Just the fact that you're trying out is awesome!
Good luck!