Stop worying about being popular, and having everybody as your friend. If somebody's picking on you, tell them to f(*k off, because trying to understand them, or trying to be their friend won't help..... That's assuming that simply ignoring them isn't working, which is really what you should do..... Be your own person, if you don't want to do this, doin't do it, if you do want to do the concert then do it. DOn't make up phoney excuses that it's somebody elses fault, if you dont' do it, accpet that your doing it for reasons other than somebody told you not too (please )

I've made several assumption about you that maybe I shouldn't have, but at the end of the day, if she's your friend, then just accept it, and don't come on here complaining about it, trying to get sympathy. If she's not your friend, ignore her, or just hit her, hard enough to let her know your serious. If you come across as a soft touch, then people will take advantage....

From what you've said, she sounds awful. If you're one of these people who has to be evrybody's friend, because it's too aquard being in a class where somebody doesn't like you, then youre 16, and will be leaving school in a matter of months, so it isn't that big of a problem.