Am I overreacting for feeling uncomfortable and upset about a friend inviting someone to our trip we have planned?
This is my first time posting so I'll try to explain my thoughts (sorry about the grammar and word jumble but I am trying my best to share my feelings on this) . I also have an itching feeling I'm overreacting.
I am going on a vacation to Italy with a group of four friends that I am quite close/known them for a couple years- this trip has been my dream so I am excited to go on holiday. It also helps that I'm with people I know because it's my first time going out on vacation without family. I'm generally a shy and anxious person, so I've been trying my best to prepare myself for this trip (It might be a little silly to go on holiday with my anxiety but I genuinely do want to go to places I want, whilst trying to overcome my mental health).
However, recently I've been told that my friend invited someone to our trip after we've booked flights/hotels/made the itinerary. I don't want to be mean, but it had put me off of the trip because I thought it would just be the four of us (people I'm comfortable with and have known for so long). I definitely feel uncomfortable with the idea of someone else joining, so it feels like I'm overreacting and fretting about this small issue. I also feel like it wasn't discussed beforehand (maybe they didn't need to talk to me about it because of course, I'm not the boss of the trip and I don't intend to be but I just feel like a talk would have been better to confirm things). I do want to clarify that I do not have anything against the person invited. I met them twice and that is all, so I feel like things could be awkward because I'm terrible with being social to new people. It's also the fact that it was discussed with the person invited first and my friend, and not the group as a whole before- So I am upset about it because I'd rather have the talk about inviting someone to the trip with the group before actually inviting them.
So when my friend told the group about it, I sort of mentally zoned out because I was worrying about it the whole time so I left the restaurant early and pretended it was okay. Maybe I should have said something but I honestly struggle with voicing my emotions and thoughts since I didn't know what to say. I do feel like staying silent and leaving abruptly was quite rude of me, so am I overreacting?