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At the risk of being lynched by the rest of the tankadin community, I am taking a different stance on the whole problem.
No, there is nothing wrong with you. No, it is not unusual to be nervous when trying to impress good guildmates. No, you are not a disgrace to mankind. But yes, you do need an attitude shift.
I was sort of in the same boat back when I first did Kara. I only started playing with tbc, so I had no raid experience, no idea what to expect really. (Well, I read up on everything, but you know what I mean.) I was nervous that I would mess up and ruin their opinions of tankadins. These people were supportive- I had no fear of them gkicking or anything even if I was worthless- but it was still nerve wracking trying to make a good impression.
I geared up as best I could, and still ran into problems. It was strange though. Some runs I felt sturdy, like there was no way I would die, other runs I felt like I could die at any given second. This was frustrating, as I had all the gear I could possibly get at that stage of the game. Around that time, I realized something. The skill, gear, and efforts of the other 9 or 24 people do make a difference. The only thing YOU can do is: gear up, practice, and prepare. When you have done those as best you can, you don't need to worry. When you have done everything possible, there is nothing wrong with saying so when things go bad. I used to naturally assume that if I died, it was my fault. Many kara runs later, I know when it is my fault and when it isn't. If you are as geared as you can be and don't do anything stupid, it isn't your fault for dying. If you are doing your threat cycle correctly, it isn't your fault for losing aggro. No matter how much we would like it to be so, being an excellent tank does not completely make up for the shortcomings of others.
SUGGESTIONS
*
Maximize your gear. I checked your armory, and you are gemming for slot bonuses and don't have most of your things enchanted. Even if you are dirt poor, get some +8/+10 stamina kits and azure moonstones (+stam gems) . The name of the game is maximizing stamina. (Along with uncrushability of course)
* If you are doing new content, watch youtube videos, read strategies, ask other players. If you are unsure of something, ask in a way that shows you are proactive.
Bad: So how do I do this boss?
Good: So, as I understand it, I tank him in the corner and avoid the fireblasts. Is there anything else I should be aware of, or anything different you guys do?
* If things do go south, there is nothing wrong with asking what happened. Ask in vent what went wrong. If it is intimated that your gear is at fault, this is where you can defend yourself. State that your gear is at the best it can be, and that it has been tanked before by less geared tankadins with less geared dps and healers.
Honestly, your teammates make a difference. Pre 2.3 I had 12.7k hp and with some groups I never dropped below 1/2 health. Post 2.3 with 16k hp, I have runs where I routinely die to trash. With experience, you will learn to recognize when it is and isn't your fault.
* Chime in when there is something you can do to be helpful. They won't always take it, but it leaves a good impression. A can do, let's figure it out attitude goes a long way.
* You will be less nervous as you get experience. Experience! There is no substitute for it.
*Do your best, have fun, work through the butterflies. Back when I played football, I felt almost sick to my stomache during pregame warmups. After the first few hits, I was fine and had fun for the rest of the game. Raiding can be kinda like that too. Tank a few mobs, notice that tanking mechanics have not arbitrarily stopped working, and enjoy yourself!
From someone who's been there-
-Kit
Edit: Vain attempt to make the formatting less painful
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