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I think the real problem is people have almost come to expect the tank/healer to be decked out in heirlooms.
This. Healers especially have gotten into the habit of expecting to just HoT up the tank and do DPS in the lowbie content. =)
At your level, the str/stam mail gear out of dungeons should be fine. More important than your stam is your character level. If you went into Shadowfang at 18-19, you're going to take far more damage from increased hits and crits due to the level disparity. Go to the dungeon finder and check the dungeon levels before you queue. If most of them are orange, go do a level or two of quests before you queue. Shadowfang at 21 was a lot easier to tank than at 19 =)
Good luck and welcome to the Wonderful World of Tanking!