In a moment of pain, the descriptor has become a galvanizing force. But what happens when you lump together a group of people whose lives differ so vastly? — I’m not Asian American. I’m a German citizen, born to Vietnamese immigrants. You could say I’m an Asian in America, though I most often feel like an untethered foreigner who’s just gotten really good at nesting. When I first immigrated to the United States, though, I was often assumed to…