Chest pain?

I’m not asking for a diagnosis nor am I expecting one. I have an appointment with the doctor coming up but I’m curious if anyone has experienced dull pain on the left side of my side right by my breastbone but more on my breast. It’s not my Breast, it is my chest and it’s a dull pain that worsens when I lay down and doesn’t last long, ten minutes at most and it comes randomly. I’m also 19. Has anyone else experienced this? If so, what did it turn out being?