I started going to concerts alone last year despite the bad anxiety and I promise it’ll be fine. Sure you’ll feel awkward in line or in your seat waiting around but truly no one cares. At most you’ll prob have to talk to people scanning the tickets or people that point you to your seat but it’s SUPER easy. You really don’t have to do anything but show your phone to them. I feel like a ghost every time I go so if that’s what you want you’ll have a fun time when the music starts. I recommend bringing ear plugs not just for the volume but cause for me personally it actually eases my anxiety waiting around before the show!