You'll be fine! Especially since you're there with your wife, you've got good company to distract you from whatever anyone else is doing is the show isn't already doing that. All sorts of people show up at concerts, even if they don't always show up in the photos and videos of those concerts as much

I went to a Heilung gig a few years back (incredible experience, by the way) and it was really funny in a lovely way to look at the crowd. It was like a straight 50/50 split of people that looked like the very stereotype of 60s hippies and equally stereotypical metalheads. We all had a great time together

I'm quite a tall guy and a not the most outgoing a lot of the time, so I do understand how it's easy to feel like you're sticking out in a crowd. Thing is though, everyone is there to see the act, not to people-wstch the audience