After a while, it sticks, and when your online you immediatly type that alternative name in whenever you see a box saying 'name'.
I'm 18 (year 2001). I got the internet when I was 15.
deceiver82517 is made up from two seperate things, both of which I thought were cool when I was 15, neither of which I think are 'cool' anymore - but hey, it's my name.
82517 - my (then) favourite episode of the cult american television series 'X-Files'.
deceiver - long story, maybe I'll write a node about it some time.