stop throwing money at your bike, are you insane?

You don't even know that anything is wrong with your bike and you're already buying new **** for it. If that's what you wanted to do you should have bought a frameset rather than paying for all those parts you're now throwing out.

And don't upgrade the seat. Nobody with any sense rides one of those plush padded seats, and there's a reason just about every serious cyclist from track racers, to roadies to bike messengers use very firm saddles.