Lizardisok? You're going way, way to fast! It seems as if you're attempting to beat something that cannot be beat (but for a hammer, lol!).
Really, you need to read more of what's going on, Google what you're wanting to do, or to find out the why's of something not doing what you think it should be. There is way, way more in the game, despite its faults than just Alduin, Paarthrunax and so on.
Please, slow down, take your time, check out things on Google as well as within Skyrim itself. I've gotten so that I don't fast-travel or use the carriages anymore. I just run from one city or village to the other.
But then, that's me, and I've been playing for almost 2-year's (XBox). Just slow up a bit, check out Google, the storyline, and how to get to a particular quest/job. Skyrim is fairly linear in how it's played, A has to happen before you can do B or C.
Check out your choices. Are you doing something just as a means to an end? To get to something? Or are you "that" kind of Dragonborn, willing to do whatever in order to gain this or that.
It's actually all on you. Just take it easy, enjoy the scenery and see how the game goes. Oh, and one good hint? Do not grab any/all book's as you go along unless it's a Tome you can use. Just quickly "read" them in case you come across one that ups your Abilities.