Caupon.. don't worry about the elder's reactions to your entry into their 'inner sanctum'. I know what they're like and as an elder's wife waiting to go home and getting fed up and knocking on the door to get the car key off hubby, I know the reaction. I tease my hubby about it being 'a little boy's club' or if I'm really fed up, 'a secret society'. Truth is I know they hate their 'after meeting meetings'. They've worked a hard day, come home, wolfed down their dinner, got ready for meeting, rushed through traffic to get there on time,maybe had to do an item at the meeting and then get told there's a 'brief' elder's meeting afterwards. I know my husband inwardly groans, as I do... it's never 'brief'! So I guess they're all very grumpy by this stage.
Enter a young man into their inner sanctum without knocking... I know it seems a terrible reaction to you and made you feel scared but don't be. They probably forgot all about it before you'd even closed the door.
I know my own children when they were in their teens had a number of occasions like this. Unfortunately older people sometimes forget what it's like to be young and how sensitive a teen can be. Don't take it to heart. You'll be ok.