OP, it can be frustrating to run content with an inexperienced tank. I'm not taking about inexperienced in specific dungeons, but inexperienced to tanking in general. As an example I queued for Qarn once to find the tank had never played an mmo before, kept losing hate, and we wiped twice before the other dps started getting really frustrated. I gave some simple tips (position mobs in front, pull with shield lob, use flash), it went a lot more smoothly and we finished with no more deaths. Maybe you could join an fc and ask them for tanking tips. Go pull up some threads in the tanking forums and read some on new tanking advice.
Most of all, just have a sense of humor. Ask specific questions in the dungeon when you're struggling. If you communicate with your party or show you are willing to adjust your party style they will calm down and be more forgiving. Also, make sure your gear is up to date and has parry and vitality. Especially your weapon.