I just wanted to give you my sympathy. I know what it's like to feel between both worlds sometimes but I have the benefit, in some ways, of being from a country where at least you can have a logical argument and say, well, I AM from here just as much as you are. But there are lots of subtle ways that Americans also make people who aren't white feel like they aren't "truly American" by asking things like "where are you really/originally from?" or "is that your real name? do you have an Asian name?" or "hey, I have an Asian friend, do you know him?" and other questions/random comments about Asia like you should be an expert (I'm speaking for Asian-Americans but you could also apply this to a lot of other minority groups in the states). Asia is probably tougher because I'm guessing it's one of the most homogeneous regions in the world. I mean, I grew up with a pretty traditional immigrant family, speak Korean, but when I talk to Koreans from Korea they always tell me, "well you aren't Korean." They are very blunt about that.
Then it's funny because living/travelling again in Europe, it's a different ball game. I get stereotyped in a different way. People can't tel the differences between Asians very well and I have gotten treated rudely a lot because people assume I am Chinese or some Asian immigrant working in a shop or like a mail order bride or something. There is definitely a passive racism/xenophobia that is pretty apparent depending on where you go to. And again, people don't think of me as American a lot of times, I'm Asian first.
I think you are experiencing a bit of a culture shock. I also got culture shock with the service in Europe at first. Then I realized, the waiters don't care about being nice probably because they aren't so dependent on tips. I just kind of got used to it.
You sound like you might fit into the US with your working habits. :P I think again this is a culture shock. Asia probably has the hardest workers in the world, even Asian companies in the US, have ridiculous hours, and if you are Asian working in one of those companies, it's worse because they expect you to be perfect all the time.
Where in Asia are you from? I was thinking maybe you might fit into places like Hong Kong and Singapore.