I've been getting bad pain in my rib area. I got checked for gallstones and is not that.
Could it be pain due to my scoliosis or some nerve problem I may have?

I had an accident when I was a child and also I have marfan disease features, like I'm really skinny and long limbs. Docs have told me I may in fact have marfan's.
I'm slim, I eat well. So I wouldn't think it's problems with nutrition.

Thanks. I'm in early 30's

No on online can diagnose you. Its best for you to see your dr.

Although I am a nurse, it is outside of my scope of practice to tell you what this is. You will have to visit your doctor for a proper diagnosis and treatment.