How to avoid anxiety when drinking/being unable to fall asleep

Hello, my (18F) birthday is coming up and my best friend is throwing me a party. I have drank/gotten drunk before and I enjoy it until it’s time for me to fall asleep. When the time comes I get anxious and restless and shaky, and I have to keep getting up to go to the bathroom. Even if I don’t drink a lot I still get this way.

I’m a generally anxious person so it’s probably connected to that, but it’s quite frustrating as I enjoy drinking and partying with my friends and would like to do so for my birthday. Any tips or advice for this? I make sure to eat beforehand and drink lots of water 🙂