Did anybody else feel like the main story was..short? *Spoilers inside*

When I first looked the game I was seeing reviews on steam from people with thousands of hours, and I thought "Can't wait to play this forever". Yet after level 15 I finished the Alduin mission. I was looking on the top of Hrothgar at dragons flying, and I expected another quest. Yet there wasn't one. I thought I glitched the game, but in the end I didn't.

And I'm already halfway through the Miraak quest.

Isn't there a mod with more quests? More stuff? This game feels way too short. For a 2011 game it is impressive, but still..

I've played this game so much, I explored every single corner of the map, I haven't used fast travel much, yet it's already over, after 2-3 days of playing it constantly.