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Do you also have pain in your upper arm, that does not go below the elbow?
Do you have any trouble with actual mobility of your arm around the shoulder?
Any neck pain?
It is a bit difficult to determine if this is a shoulder issue vs a nerve compression issue just from the way you describe it, but...
the fact that you say you have pain over the front of the shoulder that worsens with overhead movements and holding your arm out in front of you seems to more suggest shoulder issues, including inflammation of tendons (like the bicep tendon as it attaches to the shoulder) or rotator cuff issues, or impingement syndrome.
Often the best method for treatment initially involves rest -- you have to avoid all overhead and other activities that aggravate the shoulder, to allow any potential inflammation to improve. Taking medications such as advil may help with the pain and reduce inflammation. Should these not help, seeing your doctor for an exam in person and further treatment including physical therapy and steroid injections may also be helpful.