We do appreciate your app and I like your attitude. Give it a bit more, get out there and experiece a lot more of the game. I think that Ghli and Shihli did a good job summarizing the stuff you can work on, get out there and give it a go.

 What i'm going to say next might sound harsh, but it's a reality of your character:

You have no enchants on most of your gear.
You are missing gems in your sockets
You have no glyphs equipped whatsoever.
You have not even scratched the surface of being exalted with any faction which might be fine if you have just recently hit level 80.
You have not even touched the questline of the Sons of Hodir which gives you the enchant to put on your shoulders.
You have not even killed any bosses in Naxx10 or Naxx25 (which probablly explains why you never finished Naxx), but you have been (and I hate to say this) carried in sarth 1d 25 man.
You are not even geared enough to be tanking raids,
Your professions are not even at max. Your mining should have been at least at 400 if you bothered to take out 2-3 hours of your time before going to Outland after getting out of the DK starter area.

The boss that you said you mentioned is Herald Volazj, a boss in Old Kingdom. Thats a 5 man encounter, not a 25 man raid encounter.

IMO, right now, you should NOT be going back to BC and doing all the old tier 4-6 raids, even if it was fun. You should be chain doing ToC 5 man heroic and normal versions (which you still haven't even done once yet) for every plate item that drops from there, except for the healing plate. You said that your "...gear may not be the best but i am trying to improve it." Please improve it. Your gear is full of mix and match of tanking gear and dps gear that you at this point should not be tanking anything.