After playing a little bit of Dissidia 012 I'm pretty sure I've lost more than I've won at the game, and I'm playing on easy/average settings.
I know some people have a natural talent & pick these things up really quickly but most of the time, getting good at something takes practice. Games included! No need to feel pathetic... You'll improve naturally as you keep playing.
There's also stuff called trial & error and muscle memory. Both of which take time. I did most of the leveling up in Sengoku BASARA 3 by playing on easy and then just tearing through the other difficulties. BASARA difficulty though...