When you first start filming it can feel weird just talking to the camera. As with anything new, practice will help. Also, you could pretend you are just on video chat with a friend. Pick one friend or family member and just talk to them...
When I first started, I was always pointing the camera away - to show my new country to my friends and family in the US. I was narrating (live or voice over), but not showing my face. Later I turned it to face me. By that time I was a lot more comfortable with the camera in general, and just the facing the camera was new. One step at a time. Kind of like learning to drive an automatic transmission car, then learning manual - after you are comfortable with the basics of driving.
I did some practice vids, that never got posted. I recorded probably an hour or so, not in one sitting. I did some editing on it to see how it looked, lighting, framing etc. I knew it was not going to be posted, it was just rehearsal. It allowed me to get more comfortable, learn to shoot better, and helped me remember that almost any footage I shoot, can be reshot if needed. I was so stiff and unnatural for most of it, it would not have been useful anyway.
On a travel vid I may shoot the same scene 2 or 3 times, to make sure I get a good one (once I am home & editing it is hard to get back to the beach or waterfall for a reshoot). Knowing that I do not have to get it perfect in one take allows me to relax more, and then it turns out the first one is the best anyway.
Practice and relax.