How to pursue diagnosis without making my son feel that there is something wrong with him

Hi everyone! 

Im a newbie here

After much deliberation, I have decided it would be best to seek a formal diagnosis for my 4 year old aspie son.

He is such a lovely, kind, clever little boy that struggles to interact with others, which I fear may appear to others as rude or ignorant.

I do worry that the process may make him feel that there is something wrong him though, and have no idea how to explain it to him.

does anyone have any advice for me please? It would be greatly appreciated