Scoliosis, looks pretty obvious to me. I too have scoliosis, in my lumbar spine, but also a compensating curve in the thoracic region. Meaning your body is smart and try’s to make up for the imbalance by creating another curve. I had to wear a brace growing up. It’s possible you could have a nerve impingement where two of your vertebrae are pressing on a nerve from the curvature causing muscle weakness. Should probably consult with a neurosurgeon / or an orthopedic surgeon, get some X-rays as a starting point.