Why are there so few Argonians,Orcs,and other races in skyrim? I know nords are the predominant race in Skyrim,but so far i have only seen the librarian orc,the thief Jaree and some Khajit merchants near whiterun...why is that?

Am i not exploring enough or i am right that most npcs are nords?

Most NPCs I meet are Nords or Imperials. You mostly find the other races as bandits, hostile NPCs, or mages.

You can find Orc settlements throughout Skyrim (they have a sick mine with tons of ebony ore btw)

but I agree, I rarely see anyone other than Nords...

To be honest i see the amount of Argonian's, Orcs, and Khajiit that i would expect to find in the northernmost part of the world.

There is plenty of Orcs though compared to the other two.

Thats probably because

A) The climate isnt exactly the best for Swampy home Argonians, desert friendly Khajiit, or anyone looking to do anything but be #$^#$&* cold
B) The Nords are fairly racist as you can see with the Stormcloaks hating outsiders