thanks, I realized that after I referred to the posting style on how to convey thoughts. I still don't know how.
In general, we don't get to learn what characters are thinking unless they say it. But you can imply it through their actions and expressions. If you really want to sneak it in, you can sometimes push emotions as drivers before certain actions, like
*Rolls my eyes, exasperated*
But obviously, rolling one's eyes implies exasperation