Most Nepalese these days may test positive for TB on skin test because we received BCG vaccine (against TB) in our childhood. But there is no way to differentiate the positive results due to immunity you have due to vaccination or the response to real infection on skin test. THE SKIN RESULTS LOOK THE SAME. Since TB most of the times shows up in the lungs, a chest X ray gives you a clear picture. So if you do not have clinical symptoms and are relatively healthy then you should not worry about it. Final results should be fine... Goodluck for GC.
(By the way US children do not receive this vaccine so Americans free of TB donot show positive results on skin test.)