Change your perspective: don't go in thinking "I'm going to be scrutinized by strangers." Instead, view auditions as a two-way street: they are looking for a bass player, presumably to record or play out. Here's where you audition them as a group. Ask yourself questions about the group while you're their such as
-Do they have the same musical goals as I do (weekend gigging, studio albums, YouTube content, major record deal, or wherever you're trying to get to)?
-Do they enjoy working together? Would I enjoy working with them?
-Are there any red flags (house arrest bracelets, being too drunk to walk a straight line at 9am, rockstar egos already with no shows booked currently, asking if you have expensive gear/large vehicle/girlfriend into open relationships/anything else they might be using you for, etc.)?
-What is your initial impression (professional, easy going, not serious) and does that match the group you want to play with?
Audition them back. They need a bass player (we're pretty rare in most areas), so do probably 20 other bands. Play your best, but make sure you play with people who make it enjoyable, make you a better musician, or are working toward the same goals you have.