Some evidence supporting me having both fully functional hands:

• I'm good at typing. In particular I beat all my friends' scores at Facebook's Typing Maniac game, what a few of them find highly annoying and tried to beat my score. If I was paralyzed that would imply all my friends are also paralyzed, or truly outrageous at typing, or alternatively I came up with some amazingly efficient way of one-hand typing that beats normal two-hand typing.
• I play a lot of first person shooter games which by design require use of both hands, and some other games that require use of both mouse and keyboard. On the other hand I tend to suck at multiplayer mode, so perhaps I only imagine being good at them.