Do you think I overreacted? Read for details.?

I had my 15th birthday back in March. The day I threw my party was also an anime convention. I invited 7 people. 1 got sick and 2 had strict parents. The other four went to the anime convention, so I spent my bday with family. Only after the fact did I find out that they all skipped it for an anime convention. They lied to my face, one saying they had a family reunion, another had a funeral. I'm still mad at them. They never gave me a present, said happy birthday, or even apologized. Recently, they've been saying, "Aly, you've changed, you've become such a b!@#&." Did I overreact or is my anger rational?