Hello, I've been having severe health anxiety regarding pain in my right serratus anterior area.

The pain rubs down the side of my rib, the affected areas are usually tendered to touch, I get pain that extends underneath the pectoral region, it feels muscular in nature but I am unsure.
I did have an an X-ray performed; Lungs were clear, no bone issues.
I am only 20, not a smoker. I was pretty active and worked out prior to the issue.

I do not know if this is muscle, I'm afraid it's some sort of lung cancer or fatal disease, which is extremely unrealistic but it has caused a lot of anxiety and stress on me.