Your gear is fairly good, actually. You could probably manage TotC 10.
There is a little work, though, that you could do on your gear, which is probably making people reluctant to include you:
1)
Ditch the green libram. Really with all the librams sitting at the badge vendors, there's no excuse for that one, and lots of people who armory you or inspect your gear will see that green and turn you down. Get one of the badge ones,
Libram of Defiance or
Libram of Valiance, preferably. If you can't swing that, get one of the other badge librams for tanking.
2)
Upgrade your gems to epic. The absolute easiest way to get epic gems without paying badges, gold, relying on professions or guildies (although any of those options are fine if available to you) is to go turn in your
stonekeeper shards for
Wintergrasp Commendations, then head to Stormwind's Hall of Champions and buy uncut gems for 10k honor each. Then go find a JC to cut them for you.
3)
Get your mining skill up! You'll get a 60 stam boost just from leveling your mining. Consider dropping skinning for blacksmithing or jewelcrafting, either one will also give you access to more stam via additional sockets you can put in your gear, or higher quality stam gems.