"The way I see it, every life is a pile of good things and bad things. The good things don't always soften the bad things but vise versa, the bad things don't always spoil the good things, or make them unimportant." -The Doctor
but look at sam’s body language, yet again he’s being told that they need to get over it, and he knows dean isn’t gonna do it, because dean has made it very clear, he’s sorry that sam is mad, and he’s sorry that sam is upset by the situation, but he is very much not sorry that he did it, and he will not apologize, so yet again, sam has to swallow everything, and make amends for the sake of everyone but himself. sam winchester, the boy who was never allowed to feel anything negative towards anyone…because god forbid he feel things. god forbid he be anything more than a conduit for his father’s obsession and his brother’s salvation.
What if people who have anxiety are just unaccustomed to the way the world works because this is the first incarnation of their soul on the earth? And confident people are at ease with the world because they have already been incarnated multiple times and, in a sense, already know how the world works.