am i overreacting or am i right to be upset?

Gosh this happens to me a lot (for someone who doesn't really split on people lol). Two of my closest friends often go on holiday with each other and I always feel left out, even though they know (and I know) that I hate being away from home. It's ridiculous but what can you do.

It might have been a spontaneous thing on their part, or conversely they might have been planning it for a long time (possibly before you guys were friends!). Or maybe, like my friends, they understand that you might prefer some distance (such as watching tv shows rather than going out). This might be a wrong assumption on their part, but it's a possibility. There could be a lot of reasons for them going to Norway without mentioning it- do they have a shared relative/friend there? They might not have wanted you to feel left out if they were going for a specific person/reason. Don't know if any of this feels better but thought I'd at least offer some alternative explanations. You're going to feel what you're feeling regardless of whether it's an overreaction, so yes you do have the right to be upset.

I also prefer non-reality to real people :/

ahh thanks for the responses ;_;

so according to another mutual friend of ours, they knew about this trip and they've been planning it for over a month, and i've been friends with the two of them for like... one of them 2 years, the other like a decade (she's an old internet friend but i guess we only met in person like 3-4 years ago?)

like i can almost understand them not inviting me, but i just find it really hurtful that they wouldn't even mention it to me... like maybe they just forgot to tell me, but that doesn't make me feel any better lol, just makes me feel like a pointless person.

i've been invited to go on vacation (visiting her extended family in california) with the one i've been friends with longer earlier in 2015, and she invited the other friend too but that one couldn't make it that time. so maybe she was just making it up to her with this trip? but i still don't understand why they wouldn't tell me!

and mea i guess you're probably right that they wouldn't have even bothered sending me snapchats if they didn't like me? i guess my first reaction was "why is THIS the first time i'm hearing about this, are you just trying to rub it in my face that you hate me?" >_<

at the very least i feel like i should "confront" them about this but i have no idea how, because on top of being bad at confrontation, now i have to talk to TWO people at once hahaha

so in the meantime i've been vagueblogging on tumblr about how everyone hates me which is pretty maladaptive and they're both ignoring those posts (they've been interacting with our other friends' posts but not mine oops)

I know I was late, but I was going to say basically what Mea said. You can overexaggerate and it's still okay to be upset, feelings are valid and they're okay - the more you tell yourself that it's bad that you're feeling that, the worse off you'll get.

Secondly, yes, they definitely do still like you! Experience has taught me that very few people pretend to like someone, most people can't be bothered with that! So I'd definitely just try to explain how it made you feel and why you were upset, as calmly as possible - and let them know that you would appreciate being invited to anything in the future even if you decline.

No it definitely isn't un-adult! People pay good money to mediators to do just that so it's definitely a good idea!