You do not sound emotionally healthy. All the problems are created by your own thoughts, by your own feelings and by your own hypothesis. I did not see a single concrete proof of evidence to support your belief in your entire post.

1. She did not have bf, and she said that to you when you asked her. And you think she lied to you.
2. She watched movies and learnt the positions (it is common), and she told that to you. And you feel she is cheating you.
3. You are a US citizen and your parents used that to sell you in Nepal as the most prominent quality in you. And now you say - she married you cuz of your US citizenship.


Please, don't ruin your marriage. There is no issue at all. All those issues arose from your thoughts.

Talk to your wife - explain her your problems. She might not even be aware of what you are feeling.