I second what RW has said.
Don't worry about the meat yet. Just try to avoid eating beef, and hopefully, in time, meat won't become as big an issue for you.
Since you're in Cambodia, and in the countryside you have mentioned the belief in magical cows, I'm guessing that beef isn't as commonly eaten as some forms of meat. It should be somewhat easier to get around to avoiding beef.
Try living in America and not eating beef. ^_^
Luckily, Johnny Rockets' veggie burgers are AWESOME.