The, main story line keeps going and going, If anything you should have no problems leveling. I got to 28 without super quick and still am loaded with quests. The main story line starts forcing you to dungeon, so make sure it's not waiting for you to do one. After the first dungeon it starts to make you leave from where you first started at. Which sounds like Gridania. You should be on the road by popping around city to city. Just a heads up when you do travel to a new city don't do the low lvl quests, leave them for your other classes. There not worth your time at your level.