Chronic Rib Pain?

Ch

I am 16 years old and I have chronic rib pain.

Whenever I exercise too much, sleep wrong, or even just out of nowhere, my ribs begin to hurt and it's more difficult to catch my breath. I have asthma, but I don't think it's 100% related.

My ribs pop right where the band of my bra goes. I feel like I may have a rib deformity or slipping rib syndrome.

I don't know if it is the cause, but when I was 12-14 I wore a training bra 24/7 even though I needed I real bra. Wearing that training bra non stop to make myself feel better was probably not good and I wonder if it caused my ribs to sink inwards as I grew. I did not get a real bra until I was a C cup.

I've been to the doctor several times and I'm always told that it's my posture and because I have larger breasts (I'm a D cup). I feel like nobody listens to me and I am not getting a correct diagnosis. My grandmother (legal guardian) won't listen to me and just gets upset when I ask to go back to the doctor.

What do I do?

Does anyone else have this issue? Does anyone have tips on how to relieve the pain?