constant pain/aching in both shoulders

I'm only 19 but have been suffering with achy & burning shoulders for about 3 years now. Although i have had periods of relief, no amount of physio or rotator cuff strengthening seems to alleviate the pain.

I have been weightlifting consistently regardless, but the constant clicking/popping & feeling of instability makes me think there is something structural causing this pain in both shoulders.

I have just started on Dr. Schubiners 28 day unlearn your pain program, but I am not feeling very hopeful and considering getting my shoulders scanned.

any thoughts/suggestions would be appreciated thanks