Reign: Try to be nice and try to find a common interest. If you guys don't have one....well you should still try to be nice.
Anna: Well, that depends. If you're probably never going to see this person again then might as well end it then and there. Lay it gently on how you don't have any intention on being friends. If that person is like part of your clique and you just don't vibe with them, then ignore them. You don't have to talk to them or anything, right? And if this is just a one-on-one thing, ah, then end it. Make your discomfort known.
"Is it a good idea to just wing it and go to a concert alone?"
Reign: It might be a fun experience but honestly, no. Always follow the "buddy system" because you'll never know how things will turn out or how wild the concert will get. If you're going to see a mellow band and if you're sure that no mosh pits will soon break out, then you can go for it I guess. But if the band's leaning towards the hardcore side, then you should have a friend with you (make sure she/he is someone you can actually count on). Plus it's always fun to share the whole concert experience with someone cool.
Anna: That depends. How sociable are you? If you could mingle with the people around you with an instant, then go ahead. But if you can't, then you should probably bring a friend who equally likes the artist as much as you do because to force someone into going with you, and they don't even know like the whole discography, then forget about it.
"It's summer and my friends keep asking me to hang out but I don't really miss them at all. Is there something wrong with me? lol"
Reign: Nah, maybe you just need some alone time. You're probably with your friends during school which is almost like everyday for many months so I guess you just need a break from them. There's nothing wrong about that, but try to keep contact with them.
Anna: No? Hell, you've been hanging out with these people for the past 10 months why would you not want a break? You're perfectly normal. Enjoy your summer in solitude and I mean this in the best way possible.