"It doesn't take a genius to work out where it went wrong," McGinn told BBC Sport. "On Wednesday, you'll see a different Scotland. A team with a point to prove, probably more to ourselves than anything else. Seeing the amount of Scotland fans in Munich, that's the disappointing thing, feeling like we've let them down. We can't forget the opportunity is still there.
"It's been quiet in the camp but I think that's determination," he added.
"As I get older, I get more used to dealing with these situations. It doesn't get easier. I always say the lows in football make the highs higher. The lows are brutal. I don't look at the opinions of anybody else. I'm sure we've had a lot of criticism and deservedly so. It's about how we react. Knowing I could have given more is what's been stewing in my mind. If the manager gives me the opportunity again, it has to be a completely new version of myself."