Regarding California, I have to echo that not everyone in California is like the Hollywood types. I'm descended from central valley Californians -- originally from Oklahoma and Arkansas during the dust bowl. Totally different people, much more unpretentious if nothing else. Most Californians insist they're "not really Californian" because they're so different from the stereotype that even Californians have of themselves. The Mexican-American community (some of whom have been in California since long long long before most Anglos, never mind the stereotypes, they owned California first remember) is likewise generally quite different from the stereotype of shallow Californians.
But there's an attitude throughout much of the more stereotypical parts of California that's one reason I left: They don't care about people. They'll act really friendly to you. But if you're in serious trouble, they won't give you the time of day. I know someone who was homeless throughout a lot of the country, and she said California is the worst place possible. People who knew she was dangerously starving would take her out to a restaurant, order food for themselves, ask her advice, and not even order her the simplest little food, and would sit there eating in front of her. That just says it all. That sort of thing seems to be one of the cultural norms there even among people who claim to "care about the poor" and crap. It carries through into the way they vote on things. And I didn't feel safe there anymore as someone who was poor, unemployed, and saw the direction the country was headed a long time before a lot of people did. Even though I grew up there.
One thing I've seriously heard people say is that the mild climate throughout much of the state makes people not aware how much they depend on each other. Gives them the illusion of not needing each other, and therefore the ability to be more selfish. Where my parents live, in the northern mountains, there's a totally different culture as well. They're in a tiny remote mountain town that can get extreme snow and flooding and forest fires and lots of other things, and what do you know, people actually look out for each other even if they loathe each other. Whereas in many milder parts of the state many people can act like they like you, maybe really even believe they like you, but not lift a finger if you're in trouble. (This is also generally the more affluent people. Again, they can afford to think they need each other less than poor people or people in harsher climates can.)
So definitely watch out for that kind of cultural attitude. But also be aware California is a large mix of cultures and there's far more than the cultures that contribute to the stereotypes. I wouldn't want to live there anymore, personally, got nearly as far from it as I possibly could. But I hope you find it better than I did.
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams