Advice for first time ALT at elementary schools

Hello! Tomorrow I will be flying out to Japan to be an ALT for the first time, and I'm so excited but so nervous!

I have volunteered in English classrooms in Japan before while studying abroad, but I have very little experience working in elementary school classes. I am a bit nervous around kids! I'm not very experienced acting all fun and energetic, it feels kind of fake to me and uncomfortable. But hopefully I can grow into it?

Beyond that, I have all of the nerves of moving to Japan from the USA all by myself for the first time. Any advice and encouragement is welcomed!!

Edit: As I'm getting ready to fly out tomorrow I'm too busy to reply to everyone, but thank you all for your responses! I really appreciate the thoughtful replies

by Jayjayden45