my shoulders and trapezium area are uneven, what should i do ??

[gmc20199]

i am 16 years old and  i have had this problem for about 3 years now ( possibly due to carrying a heavy school bag. ) i experience a lot of pain in my left shoulder, left side of my back as well as my neck and my left shoulder also makes a loud grinding/popping sound everytime i move it or roll it back. the trapezium is visibly a lot higher and seems to be swollen and is tight ( compared to the right  side which has no issues) .  i have gone to the chiropractor and gp and i’ve only been given exercises to do which don’t seem to be effective as i’ve seen no change, even doing yoga hasn’t helped. due to pandemic my school has been closed for over a month now and i haven’t been carrying anything heavy for a while so it hasn’t gotten worse. is there anything i can do help solve this??