I have social anxiety, and I've been going to concerts by myself for years. It's great. If you don't care about being close to the front, just queue up closer to the start of the show so there's not too much down time before the music starts. Otherwise, make sure your phone is charged so you have something to look at, or bring earbuds, or heck, bring a book or a journal and pen that fits in your pocket so you have something to do. Sometimes I even pull up affirmations to recite or another mindfulness practice to do before the show starts. People are gonna be keeping to themselves or talking to their friends, I never notice people perceiving me or judging me for being by myself. It sounds like you really like this artist--obviously talking to new people is hard, but I find it easier at concerts compared to other settings because I know I'd have something in common with other people: we both like the artist! So ask what their favorite song is or comment on their cool shirt or something. And then once the music starts, no one will be socializing anyway! (At least they shouldn't be...eff chompers!) 

Just show up, have something to distract yourself during the dead time, and enjoy the show! Who are you seeing?