Tendinitis?

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I have a pain in my right shoulder, it is currently just next to my shoulder blade, but sometimes it’s on the top of my shoulder, my collarbone, where my shoulder connects to my neck, it ranges. I’ve been to 3 doctors, (my regular doctor, a specialist, and a physical therapist) my regular doctor did X-rays and an mri, he said that I had mild tendinitis. I got referred to a specialist for treatment, the specialist looked at the same mri and said he saw nothing, but you can hear and feel my shoulder pop whenever I move it. It also hurts when it does that. He referred me to the physical therapist. The physical therapist said it was probably my posture (which I can guarantee it’s not, I have great posture) he gave me some exercises to do but they hurt so bad to do, even after just 30 seconds of doing them that I just can’t do them anymore. I am probably going to get a cortisone shot for the pain to help. I am a dancer, but it doesn’t always bother me at dance, I’m also 18 and have been dealing with this for about 2 years. I know not many of you are doctors or can give actual medical advice, but do anyone have any personal experience with this? What did it end up being and what treatment did you get and did it work?