@wrzakers A pain in the shoulder blade may be spine related or possibly due to a condition called thoracic outlet syndrome or TOS. There are major muscles that connect the shoulder blade to the spine as well as spinal nerves that serve them that may be compromised with compression. TOS is a compression syndrome that causes arm pain and weakness. It also moves the shoulder forward which is a bad posture for aggravating the nerves. Correcting posture helps both TOS and spine problems. If there are cervical spine problems, muscle spasms can cause shifting of vertebrae that tends to increase pain and symptoms. You can have both conditions at the same time causing overlapping symptoms. A neurologist can diagnose TOS.

My suggestion would be to find a good physical therapist for an evaluation, and someone who is familiar with rehabbing cervical spine and TOS patients. I have both and have done a lot of years of PT for TOS during which a cervical spine problem became evident. I had a ruptured C5 C6 disc that had collapsed by 50% causing spinal cord compression. I had a cervical fusion done with only a bone disc spacer and no hardware which gave me a lot of relief. I do stretches that I learned from physical therapists to maintain flexibility and loosen tight tissue (including surgical scar tissue) as routine maintenance.

If your doctor offers imaging such as an MRI, that may lead you to a consultation with a spine specialist. Doctors that understand TOS are harder to find, so you may want to look for a place that treats the condition of TOS and also see a spine specialist there. Mayo is a good place for that, and my surgery was at Mayo. A physical therapist is a great first step to take and if it helps, that may be enough. A sharp pain is a warning sign that needs attention.

Here is Mayo's information on TOS.
https://www.mayoclinic.org/diseases-conditions/thoracic-outlet-syndrome/symptoms-causes/syc-20353988