Suggest Treatment For Right Shoulder Pain

well, ive been playing baseball for 2 years now.. and Ive got this pain in my right shoulder because Im a pitcher. I dont think its the rotator cuff because I can lift my arm with no problem wat soever.. But the thing is, when I throw, I get this pain in, my rigth shoulder. I have thsi pain for about a gudd 5 or 10 min max. To tell you what part of teh shoulde hurts, Ill tell you where I get teh pain: when I lift my right arm up straight high above my head, then I pinch a little to the left, that's when i get this small pinching feeling... another way i get this feeling is when I lay down on the floor, stretch my arms straight above my head, then kinda loosen the shoulder muscles, I get that pinching feeling again.. Do you know what this problem is?