My one non muslim friend ask me why u muslim done khatna(musalmani or sunnat),
Give me the satisfactory answer that I told him.

We call it circumcision in English if it helps.

But... are you asking us what you told him? :confused:

Or do you want to know what to tell him?

Well, I think that your parents are the ones who are in the best position to answer you. Have you asked them first?