No need to be embarassed. I felt the same way when I joined my first group and was told that it was automatic. You'll get your chance to be the smart ass someday. ;-)
Yeah I realised that after I made this post lol, little embarassed :$
I think the display pic is defaulted to whoever is the newest member of the group. Both you and our newest, Peachy_Sweet are excellent choices, for however it is done.