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Generally, if there is clicking there is a muscle imbalance. one of the possible options is that your upper trap is to tight. have someone check the bottom of your scapula and see if they are even on...

both are, radius is thumb side and ulna is pinky side

This is wrong, the muscle that does the opposite of scapular retraction (protraction) would be the serratus anterior. Since the pec inserts on the humerus it is necessary for the arm to move to train...

pectoralis major performs internal rotation and adduction of the glenohumeral joint. the teres minor and infraspinatus perform external rotation(the opposite) and the middle deltoid perform abduction...