In my opinion Nerd is just a label that people give you. I used to play World of Warcraft, Runescape, and xbox etc. and i was never a nerd. I always had a shit ton of friends and a great social life. Its just a label people give you to add to there mental list of "flaws" or things to pick or make fun of you about.
Now if your a kid that has NO social life. Only worries about school. And plays video games every second of there spare time. Then yes, I myself would deem you a nerd. But i have no place to judge anyone.