Chest pain from bodyboarding several days in a row

Im 37 so I cant do it like I used to but damn the left side of my chest is so sore from paddling and lying on my bodyboard. This happen to anyone else? I feel like I bruised my ribs lol. Its like right on my upper abdominal muscles. It doesnt really feel like the muscle itself it feels like my chest…bones hurt from the pressure of lying on the board while paddling.