Hello, newest Scott! Welcome to Hawaii! Please excuse the ramblings, I'm coming off of no sleep and a cross-continental journey, but it is what it is!
There's a portal that's brought you (and all of us) here. There are a lot of multiples of each of us, and we're all from different worlds. Some differences are huge, some are small. There may also be people here from your world from different points in time, because that happens too. We're not the only ones, either! There are people from all sorts of places and sources, but it all seems to come from film, tv, books, comics, etc. Technically, we're from a tv show on MTV called Teen Wolf, though most of us have super different lives than the show depicts.
It's all super overwhelming and, like Scottie D said, seemingly irreversible right now, but you'll be okay! ♥