why wasn’t i invited?

My friend group is kind of scattered at the moment but when it comes to party’s we stick together. There’s a new girl at my school this year, and we talk all the time and i thought we really hit it off. This weekend it was her birthday and she invited everyone and in my friend group except me. Some of these girls, i’ve never even seen her talk to. I know i’m a little weird and quirky but am i that unlikable? It doesn’t help that she’s instagram famous. None of my friends even care, I don’t know what to think.