I have a condition similar to yours and I deal with it by consultations with psychotherapist. I can discuss a lot of situations with her, and to reflect on what I did and (more importantly) what I didn't. There is some subtle code of friendliness, like asking pointless questions ("how do you do"), saying pointless things (like reflecting your current emotional state), and so on. I need to see when it is time for one more pointless action, and to do it. It is not hard to do, but not so easy to discover what and when to do, so psychotherapist is a real help here. For me it looks not like I'm trying to be ingenuine, it's like I'm trying to look a human being for others, so they see me as the person, not as a coworker.

It is mine condition, and my way to deal with it. Seems plausible for me that your case is like mine, because you are saying that your parents are immigrants and very probable that you just don't have some behavioral reflexes. In any case, you can find cognitive-behavioural psychotherapist and discuss this matters with her. If your case is not like mine, that at least you'll know that it isn't. Hopefully you'll find what you can do. But in any case you start with desire to change yourself.