We tend to forget that when we talk, more of the information we relay is presented in the form of the facial and body movements. We don't really listen to the one speaking, we watch them.
This is the fundamental difference between writing and talking, and the reason why it seems so deceptively easy to write (anyone can do it!) and yet is so incredibly hard (why does everything I write down sucks?).
Writing is not the same as talking.
In writing your job is to show the reader what they can't see, because they're not watching a person talk, they imagine them.
Hence, show, don't tell. And the use of the camera for the descriptions. And minimal dialogue (only when absolutely needed).
If you discipline yourself to always always ALWAYS think that when you write something down, you have to convey BOTH the spoken words and the body language, you'll be already more dangerous that other writers out there.
When you re-read what you wrote, is it clear what your character is really saying, what they're really going through? What if you remove all dialogue? Is it still clear? No? Then delete it all and rewrite from scratch. Do it until you can "see" the action unfold as if it were happening in real life.