*mildly amused, because he's being nothing but helpful. it's not his fault you have an exterior monologue. once they're far enough around the lake so they can talk, Jace sits down on a rock and speaks aloud.*
Here's the short version. You're a telepath; you can at least project your thoughts, and maybe receive thoughts from others. Right now, you don't have any control, which means you're broadcasting everything you think to anyone who can receive it. I'm guessing that's not something you're doing intentionally.