Is it normal to have conversations with yourself using snapchat?

I don't do it too often, but I tend to have moments where I enjoy talking to myself using snapchat. I tend to observe how I sound and my facial expressions. I tend to not exactly know how my facial expressions when expressing some emotions. Has anyone else done that?

If it is, I feel so odd doing it in front of my girl. Who is like my number 1 trusted person.