Someone just told me I can't be a tank if I dislike blocking. I'm fairly certain that, if I'm keeping the enemy's attention on me and dealing out lots of damage while taking all the damage the team should be getting, I'm a tank. A shield's got nothing to do with it as long as my armor's good and my health is high and no one rushes out in front of me like an idiot. :/
You don't need a shield because you are a shield.