Hey madiyaan,
Just writing to express my frustration as well.
I believe I have an almost identical problem with my shoulder.
I'm 21. When I was 14 I fell into a river on an outstretched arm. I did not rest/rehab my shoulder in any way at the time, ignoring it thinking it would recover. In hindsight, my symptoms match a bad grade 1 separation as the AC joint is slightly deformed but still attached.
I have done lots of weights training over the years. I too hadMRI/MRA and they found supraspinatus/infraspinatus tendinosis but don't believe this is the underlying problem. My AC joint looks like yours, hence the doctors have ignored it.
I won't go into further details as it is a rehash of your symptoms but like you I am STUCK on how to resolve this (and the loud clicking!). No one has an answer. Let me know if and when you have one.
Thanks