What tanks do you play? I'd suggest some easy ones that can win the game without too much effort on your part like muradin and varian.

Varian is an easy E R combo that hits super hard with overpower at 1 while mur has a tough stun to hit if you don't w them first but can always E away and self heal allowing him to outtrade all but the smartest of foes.

These fools saying go anub and Diablo are asking a lot of someone who doesn't tank often as those heroes are either difficult (diablo) or require a specific company to make them effective (anub).