I'll put everything here in the context of a PvP based games (shooters, fighting games, MMORPGs, etc), since it's easier for me to make myself clear in this context.

~intro~
In every PvP based games you try to defeat the other player. Doh, but it's not so simple as it sounds.
Why do we hate someone if he kills us? Is there any particular reason for that? Or is it justh humannature? But above all...does it make sense to hate a person like that?
This should be...

~from then to now~
I started to play games since I was 4 (I'm 17 now). I was lucky that my father ran a business involving computers, since computers were rare in that day, not mentioning people that understood them.
My father had a laptop (yes, they exist) and I used to watch him play Doom II on it, which was a featured game at his work. (they sell computers, not video games)

It probably was the SNES that I played for a darn long time. I was a money eater back then....