Hi and Welcome to HCM,
This condition occurs in ligament tear and rotator cuff injury
. Normal position of the shoulder may be disturbed. This is due to unusual form of physical display. You can take an x-ray to exclude rotator cuff injury. Consult an ortho specialist. For time being you can take pain killers and topical pain relieving applications. Give rest to the shoulder region. Your shoulder is not torn. There is possibilities of rotator cuff injury and remote possibilities for dislocation of shoulder.
Wish you a speedy recovery.