Destiny says: Do what sounds more fun to you.
Close your eyes and picture yourself hanging out with Matilda. You’re watching movies and eating those cookies her dad makes. Now picture yourself at the Billie Eilish concert, dancing and singing along. Ask yourself: Which looks more fun? Based on your question, I’m guessing it’s the concert.
The truth is, it’s easy to get caught up in what other people want from you. So you have to remember to ask yourself what you want. You might disappoint someone, but that’s part of life. Who knows when you’ll get another chance to see Billie Eilish?
Sure, it’s not nice to cancel plans with your best friend. But sometimes really special experiences come up. I think this is one of those rare times. If you kindly ask Matilda to reschedule, she should understand. If not, that’s her problem. It would be pretty selfish of her to make you feel bad for taking the concert ticket. So I say go to the show and have a blast! (Just don’t post on Instagram. It might make Matilda feel extra left out.)