Sharp pain in chest when i breathe deeply but im healthy?

This comes and goes. It's not frequent. But its been going on for as long as i can remember. I cant find anything about it on the internet.

Im a 23 year old fit female. I eat well, exercise regularly, had a baby 8 months ago. I mentioned it to my fiance and he seemed to think it was strange so I started telling others, my cousin knew what i was talking about but everyone else gives me weird looks. There arwnt any noticeable consistant triggers. Seems pretty random. It hurts when i breathe in deeply, until i breath deep enough then it goes away. What is this and why do i have it? I have healthy lungs too