Hey there...
Normally the dominant shoulder is slightly on the lower side in 90% cases. So if it's on your dominant arm, then it should be okay.
But if one of the shoulder is considerably higher than the other ( 2-3 cms) then its better to get assessed by a Physiotherapist.
Next Steps
See a Physiotherapist. The Physio will assess
-Shoulder joint and Muscle strength at the joint
- Posture : looking out for scoliosis, scoliosis is abnormal bending of spine which causes one side of the should to 'drop' & the other to 'rise' considerably ( functional scoliosis is easily correctable)
Health Tips
Scoliosis may/ may not cause spinal pain.