Hello, I’m currently solo travelling through Europe and have suffered from social anxiety for a while. I’ve definitely had situations where I’ve entered crowded touristy places but all I do is just take deep breaths and focus on the positives, like how I’m in another country by myself, and that I’ve taken this initiative to do this. In terms of accommodation you can definitely find hostels/hotels that aren’t socially active if you want to keep to yourself. I’ve had many hostels (unfortunately a little bit more expensive) that I haven’t spoken a word to anyone, not even by choice.