If you were to take away human error, this is what would happen. The pitcher would make a perfect pitch every pitch, but if the hitter cannot error, than he will hit a 500 foot home run every time. It'd get old pretty fast. Everyone would be pretty freakin good at everything.
As for umpires, here is a quote I found and like: "To err is human, but to really foul things up requires a computer."
You don't get rid of umpires calling balls and strikes. Deal with it. You're 14 years old. If you can't deal with an umpire calling balls and strikes, it's definitely time to find a new position, or for that matter, sport.
You can say that he missed calls and you walked in runs. But, I bet he gave you calls that the batter didn't like whether it be high or low, inside or outside.
If you want computers to run everything there's a game out called MLB 2K8. I think you can pick it up at any electronic store....