I really don’t have an answer to your particular question but I will say I get butterflies before a session and it’s the same feeling I used to get before a game when I played competitive sports. I think this feeling is normal so best thing is to accept it as normal and not worry about it. Like you the butterflies disappear once I get inside the session space and like they did once the game began.

This would actually be a good topic for the lobby here. I’d think nervousness and butterflies before a session are more the rule than exception.