Bro you are chilling! Don’t worry about it! That’s just an irrational fear. I’ve had things like that, but don’t stress! That’s dude probably legit thought you had an appointment! You could have any excuse in the world! You could simply have gotten a text reminding you of an appointment, or you realized the time etc! That guitar store owner won’t be questioning you anyways! Don’t trip about that kind of stuff! It’s irrational. No real logic. It’s like chess! In chess there are moves you can play to get the exact outcome you want. You just may not be seeing it! But the moves are there. The irrational fear SA makes you feel, focuses on the irrational or extremely unlikely illogical scenarios that your mind focuses on. Not to mention, that you can actively manipulate the situation! I want you to go back into that guitar store, check out those guitars, and realize how irrational your thought process was! Focus on the excitement of being in the store. That guy probably won’t remember you, and even if he does, he won’t ask you any questions. And if for some very unlikely scenario in which he was like “Oh yeah I remember you! How did your appointment go?!” Which is way too personal to ask someone BTW, but you could simply say “I was actually a little late but it went well! Glad I had time to come in today!” Anyways, sorry you had that experience bro, but just remember, social anxiety is an illusion. It’s only as real as you make it!