What’s going on for me at concerts?

On NYD we went to see the Roots- amazing band, incredible live- at Sydney Myer Music Bowl at Melbourne. At concerts my brain goes wonky. I cannot keep focussed on the music. I think about a billion things, what the people around me are doing, what my partner is thinking about, and everything and sundry that whacks me in the brain hole. I cannot for the life of me get lost in the music, even when I adore it. I watch people vibe out and be so consumed but I cannot get there, no matter how hard I try.

What’s happening to me, and is it happening to any of you?

Edit- I am describing having a bad time - it is not pleasant. I am desperate for it to end so I can go home and get out of my brain!