Why is my nose pinched at the bridge and what can I do about it? Why is it so disproportionate? (Photo)

Your nasal bones are narrow in the upper third of your nose. It also could be that it's so narrow but that your nasal bones flare out, making the part of your nose above it look narrow.   There are a few ways to correct that. Onlay grafts, osteotomies to reshape and reset your nasal bones, and nasal valve grafts to slide underneath the nasal bones. Which technique used will depend on your profile view. 

The information in the photograph is quite limited. I would suggest you visit a good plastic surgeon and discuss your aesthetic goals with the benefit of video imaging.

You can have a more refined nose that is
natural in appearance. I perform these surgeries with closed technique
to preserve the structure of the nose and minimize visible scarring.Kenneth Hughes, MDLos Angeles, CA

I think that you need to be seen in person to be properly evaluated.  The photo is very limited.  Best of luck.

Without a history of an injury this just falls into the way you were made category.  Not everything we see can be seen in our parents.  16 years of age is on the cusp of where we start doing rhinoplasties.  A consultation with an experienced board certified surgeon can help you sort things out and see if surgery is appropriate. 

Without a prior injury or rhinoplasty, we would have to say that this is just how things are. If you are very self conscience a consultation with a plastic surgeon in your area might offer you a solution.