Thank you all for your help with pre-diagnosing my injury.
After further researching about possible injury locations i believe that somehow the bicep tendon is also involved(overstretched? possibly). I come to this conclusion because I feel my proximal bicep portion is slightly sore. However, i am relatively sure it is not the bicep tendon alone.
I have trouble at the very limits of internal and external rotation, but most especially external(i.e. trying to put my hand as high as i can up on my back), i feel sore right near what i describe as the anterior deltoid. Looking at anatomy textbooks it looks like where the subscapularis attaches to the humerus.
There was never any swelling but if i tried to exert myself in any sort of external rotation(i.e. putting on the strap for a backpack) or wide grip curls, i would a slight pain in the short head of the bicep.
I plan on going to an orthoped, but unfortunately the appointment is set for 2 weeks from now. Until then i plan on resting the shoulder as much as possible.
thank you again.