You are not alone. If this is your first convention, if you came by yourself, if you don't know anyone here, don't be afraid. There are hundreds of us. But we're very friendly people and we rarely actually murder anyone. Panelists, authors, convention staff are all volunteers, so be patient with them.
Authors are people, too.
They need to eat and use the bathroom like the rest of us, please let them do so in peace. All panel sessions are taped and no one who buys it will hear your question unless you step up to the microphone. Don't be shy. No photographs or autographs in the bathroom. I've seen it happen.