My left side is uneven! And I've got mild back pain, help!?

I'm 16 and recently I've noticed my shoulders are uneven the same with my legs and a little in the hips but more noticeable in my shoulders, I have had mild back and spine pain for about a month now and have seen my doctor about it but he said that it was just stress, I haven't yet seen him about my unevenness. I did show my mum tho and she didn't seem to take a grate deal into worrying about it! It's starting to be annoying because my clothes don't sit right on me. I've looked up what it might be and all I'm seeing is scoliosis, but I don't seem to have a curve in my spine (that I know of anyways) I have as well notice that my left rib cage sticks out about half an inch more then my right one! I have asked mum to take me back to the doctors for a check up, but I'm just worried that they will miss diagnose me with something that I don't have😕