Huge pary, I'm not invited

I don't know what to say. I don't know what I want you to say. I'm just devastated.

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So I made a couple of friends lately. We spent a lot of evenings together and I really thought that I can finally fit in without forcing myself to be another person. But today is different. One of them throws a huge party with 50 people, a lot of alcohol and live music. Everything seems to be great, on the photos I receive.

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It is not that I have the biggest friendship with the host, but I am part of the group or at least I thought I was. He basically invited everyone he once met and I am left out, watching all of my "friends" having fun. And no, he didn't just forget to invite me, we even talked about me being not invited and he just went on. I just don't understand what I did wrong.

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I know that this is a first world problem, but it is just crushing my hopes once again. This lonely evening will be a tough challenge. :(