I'm upset at some friends for making a mistake and feeling that they didn't do a good job to make up for it
What was the mistake they made?
We're in a rock band together. Yesterday we had a gig and they ruined it.
It sounds like you think it was their fault that the gig was ruined. Harboring resentment for them won't be good for the band, so maybe you should have a talk with them to try to work things out. If you don't talk with them, then they may make the same mistake in the future.
I still feel really hurt that they would ruin the gig for me like this.
It's understandable to feel hurt, but you should consider forgiving them. Forgiveness doesn't mean that you excuse their behavior, and they should definitely still apologize to you, but by forgiving then you can begin to move on from your own hurt.