Left out again

My 2 best friends are going to a concert without me. Theyre going to see Mitski and i like her too. Im not so mad that theyre going without me because i probably wouldnt have gone but they could have asked if i wanted to or at least told me about it before buying tickets. They said they didnt know i liked her but ITS NOT THAT HARD TO ASK. And i cant be mad because i dont want to ruin it for them but still. Im a little mad. Am i right for being mad?