Being left out on new years

So basically, every year my(15nb) friend, who I'll call P (14F), throws a new years eve party and sleepover. The party is usually our (pretty small) group of close friends, since last year the friend group has had quite a few things happen changing who is a part of it. This year I asked P if she was having her party this year she said no. So we continued hanging out and just before we left the place we were at I double check that she wasn't doing anything. Later that evening I get on face time with my friend B (14M) and he was talking about how one of our other friends, K(15F) was buying a cake. I thought this was kind of random so I asked why K was buying a cake, and B said for P's new years party. It took me all but 1 second to realize that i wasn't invited (mind you I have done nothing wrong to any of the people that were invited, i double checked with everyone). I lost it and somewhat broke down. I was more upset about being lied to multiple times, so I reached out to two of my friends K and W(15F), K didn't respond for a couple of hours and W lied to my face again and claimed they didn't know anything about the party; despite being in the group chat for the party. I finally reached out to P, and I told her I knew about the party and that I was sorry for anything I might have done and that I was extremely upset about being left out and lied to about it by multiple people. She apologized and said that there was at least one person who would've been uncomfortable with me being there (haven't been told who). My friend L(14F) reached out to me and told me she just found out what happened and was very upset about it. She pointed out the fact that I haven't done any thing to anybody going to this party. So this all happened the night before new years eve. Yesterday I reached out to my boyfriend V(14M) I told him what happened and invited him over, then he didn't have a ride home and had to spend the night. We ended up staying up until six in the morning playing video games together. So I ended the year with a big high and a big low, and im not thrilled about having to go back to school on Monday. 

Anyway hope your new year is going well!