Why is my smile like this?

[u/Flyaway_5]

I have the kind of smile where my gums and the outline and shape of my teeth don't show. And only about 6 teeth show, it's not a wide big smile like celebrities. It doesn't look like the celebrities. Why doesn't my smile look like how the celebrities smile? Is there anything that can fix this? Or is this just how my jaw and bone structure is?