You have a point; OP doesn't sell himself as the ideal tank and from what he said he certainly made some errors.

But you've radically missed the point of what he said.

Just as you said, he made mistakes that he owned up to, but do you really think he posted in order to just ask for a beating.

That's where your frankly rude false paraphrase, your takeaway, misses completely. He was let down by his group and it caught him by surprise. That's what he is saying, and responses like yours, plainly meant to injure further, are why players fail to improve.

Good job.