There's a few gear slots that could use an upgrade, especially the accessories on the right side so make sure to upgrade those and fill in all empty slots as soon as possible. That'll help with dps and survivability, but it's a pretty common mistake for new players because you can level out of gear before you realize it. You do have a lot of empty slots and lvl 1 accs though.

Only other thing I can think of is if you're not moving out of aoe's fast enough, or if you're hitting the wrong mob (in which case the tank could just start marking the ones he wants the dps on in the order he wants to kill them if it was a major problem). Those things take a little bit of practice sometimes, but it kind of makes me want to blame the healer more than you since they chose to insult and "punish" you rather than give any explanation what you're even doing wrong. Then again, I wasn't there so I have no real way of knowing if they tried to.