[He listens to everything she has so say, then sets his cup down decisively, and leans forward on both arms to face her.]

Katara. The only thing we can do in this place is "assume". Assume we're actually here, that we have these wings on out backs, that I'm talking to you right now.

What you just said-- you can "barely keep anyone safe"...what makes you think that's your job? You didn't say trying to keep people safe, or wanting to keep people safe; no single person in the world can truly keep another safe without exception. Your expectations of yourself are so high that when they fall you're the only one who's going to be hurt.

Those "what ifs" that are filling you mind? For one thing-- they are the product of your own worries. For another, there's nothing you can do about them if they are true. You just have to let go, and focus on what you can do.

Because trying to carry the real worries and the ones in your imagination is going to wear you down-- and then you won't even be able to try to protect anyone.

[he leans back again.] You haven't been eating, have you?