That is a matter of opinion. You see a narcissist, I see a self-confident winner.

“One main reason that people wonder about the psychological dynamics of Donald Trump, is that time and time again he violates or simply ignores political decorum. In other words, his words and behaviors do not line up neatly with the expected norms of political comportment, especially for an American presidential candidate. Of course this is part of his political appeal to much of the public.”
http://thehill.com/blogs/pundits-blog/healthcare/290552-we-should-stop-calling-trump-a-narcissist

In other words, he’s not a fake like 99.99% of politicians, this pisses off the establishment which then labels him a narcissist.