Rotator cuff injury or shoulder impingement. Likely due to scapular issues and muscular imbalances. Get an MRI when possible. In the mean time you need to work on preventing further injury and to stop irritation of the tendons and tissues. Strengthen your scapular muscles, posterior delts and lower traps to prevent shoulder downward rotation, stabilize the shoulder joint and set up the chest muscles properly to push with the pecs. Lots of good info online from resources like Eric Cressey, Mark Coles, Athlean-X, etc.