Hello my name is Hannah and I am 22 years
It seems related to lifting heavy weights
Hello and welcome to Ask A Doctor service.
I have reviewed your query and here is my advice.
This seems related to nerve getting pinched at the shoulders due to lifting heavy bag on right shoulder or just lifting weights. Another cause could be repetitive movement at the joints causing the stress.
I will suggest that you do some shoulder exercises. You can consult a physiotherapist about it. You may avoid lifting weights for sometime.
Anyways an X ray is needed to rule out arthritis.
Hope this helps. Let me know if I can assist you further.