It sounds like you are rushing, why don't you take the time out and farm some materials, gain some new familiars and level them to their higher forms, check your compendium stats and if you are in the mid twenties or lower then yes you are just speeding through the game, sigh!
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You'll probably need to grind before the final bosses, not to mention sidequests open up in towns you've already been to once you unlock more pieces of heart. I'm at like...45ish hours, and just beat Shadar, and there is still more to do, not to mention post-game.
With sidequests/bounties, I'm at 14 hours 29 minutes to this point.
Also my characters and familiars are around the 22-23 level range.
If you had to give a percentage, how far into the story would you say I am?
14 hours and you're already am Hamelin? It took me about 30-35 hours before I made it there. That included a lot of gathering, serenading familiars and leveling them up. I'm now about 45 hours in, and I've only just finished a short bit after Hamelin, to get access to Tokotoko Adventureland.
And the sad thing is, I wouldn't say I have taken it slow, either. I would say I'm way overleveled, but I don't believe in overleveling, seeing as the developers gave us level 99 for a reason.
"If you've got yourself a dream, work hard, believe in yourself because I know dreams can come true."- Dennis DeYoung 1997