As someone put above.... Breathe in through your nose, not your mouth. There are even "breathing coaches" that typically cater to athletes and rehabilitative/trauma patients. You can probably get by with a couple of the "How to breathe" youtube videos, adjusting your posture, and a bit of practice and self-awareness.
You may also want to speak about this with your primary care physician, as it may indicate an esophageal malady, sinus issue, etc. You might also have adversely affected your jawline and need to correct it.
As a bit of a side anecdote.... When I was in my teens, I went into the US Olympic Development Program for soccer. I was evaluated and assigned a "running coach". Until that moment, I had no idea there was a right and wrong way to run/sprint/jog/etc. He worked on my posture, symmetry, breathing (When and how to breathe when running), foot placement and alignment, and many other facets that I had never considered. Before getting a coach, running was "go fast" and sprints were "go really fast". After coaching, I realized that running was a complex coordination of multiple disparate systems working in unison. It took my 2-mile down from 12 minutes to 10.5 minutes.