Good thread post man, I feel like everyone can relate to this at some point when they started. Just keep practicing your commentary and watch over your videos to see how you sound. Once you realise what you are doing try to do things differently. All about self awareness, but as you talk more into the camera the more comfortable you will be. I'm still learning but I found that making instagram stories on a daily basis documenting what you are doing goes a really long way. It will build confidence and make you look more natural in front of camera whether it be video or just audio. I hope this helped you in some way