When i work for 10 mins, i have a burning hurt in my back right below my right shoulder blade, when i stop work it gets a lot better. what can this be?

Varies: There are a lot of possibilities and i would encourage you to get checked. Many potential causes are musculoskeletal and quite benign, such as a subscapular bursitis or a thoracic radiculopathy. But there are more potentially dangerous conditions including the possibility it is an abnormal presentation of cardiac ischemia. A detailed exam and appropriate tests can usually determine the cause.