Its possible that you could have a shoulder impingement which is very common amongst bodybuilders. I had one myself and had shooting pain just like your describing whenever I did exercises involving the shoulder. Mine was more on pushing movements instead of pulling but it can run both ways.
Of course we can't really be sure what it is but it sounds like something is being pinched or rubbing which would indicate an impingement to me. Might want to try an impingement test yourself and see if you can self diagnose it.
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