Level 81 GNB

So I started playing Gunbreaker recently after putting off learning tank for so long and I love it!

I learned how to play The class fairly fast and feel like I'm doing a pretty good job keeping aggro, making sure I MIT damage, I can do wall to wall pulls fairly decently my health only drops to around 45%-50% most of the time.

It's just when we die is when I get anxious because I feel my mitigation isn't enough, then the thought of people blaming me for not taking enough damage sets in. My DPS is taking damage even though I have my stance on, I'm using AOEs, taking the aggro if somehow they get aggro yet people are still getting hit. My healer mainly focusing on healing instead of being able to do damage. All of these gives me massive anxiety and I just wanna tank.

I've done about 10-15 dailies so far and really only died 3 times, once was because I forgot a boss mechanic which wasn't really due to tanking the other two were my first few times doing W2W...

What's the best way to get over this anxiety?