What can relieve my back pain ? most likely right near the upper back beside the end of the shoulder blade /near spine

Specific exercise: You are describing scapulothoracic myalgia – a benign muscular pain. At 16, you are supposed to be healthy with a normal back. Be careful with unsupervised and undisciplined weightlifting with poor technique. Exercises specific to improving this condition include pinching your shoulder blades together – this strengthens your rhomboids and other scapular retractors. Get advice on proper exercise.