Not a Model….

Hello everyone! Sorry if this post is not allowed but I don’t know the best place to ask. I am wondering how a person would learn how to look better in pictures? I have always felt extremely awkward when someone asked to take a picture of/with me and it shows. I don’t know that I have ever had a decent picture taken of me. My smile alway looks weird and forced and I’m always the odd man out. I figured I would ask the professionals for some tips?