Confused about my roll in groups...

[Budder]

So as a warrior I thought first and foremost my job is to engage the bad guys and keep it on me as I should have the most hit points and highest AC. I’m a bit confused by tank vs DPS and which one I am. I’ve been told a few times by other DPS group mates (rouge and Ranger I believe) to stop taunting. Wtf isn’t that what I’m supposed to do? Also was told that to hold agro I need to DPS with fast weapons, preferably that proc. And if I was to “tank” I need to use a high damage 2 handed weapon. To me they’re kind of both the same as I want high DPS in order to tank yes?
So what situations do I use DW fast weapons vs. a bigger slower 2 hand? I just figured my job as a warrior was to take the hits so the rest of the soft targets can do there thing and not get dead.
Thanks, I know it may sound dumb but I’m just trying to be the best warrior I can for my group/raid whatever.