Rotary cuff pull?

well beginning of March, a football come my way and a friend asked me to throw it fund to him... i tried my best and threw it, but felt a sharp strain when i did so. didn't think much of it but as weeks go by it hurt more and more. its now june and i still havnt get a chance to check it cuz' be waiting on my insurance fixing. going in pretty soon, but read online i might of damaged my rotary cuff? it hurts to lean on when lay down, sometimes when putting on clothes, carrying heavy things, raise arm up in faultless ways... has this happen to any one? its been a while immediately and it still hurts so i'm guessing i did do something to it.
Answers:

Do you think this is unnatural?

its very possible that it could be your rotator cuff...see an orthopedic doctor

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