Shoulder and arm pain, can't lift my arm wellㅜㅜ

A few months ago, my shoulder started hurting, and at some point, the pain in my right arm worsened, making it impossible to lift my arm above my shoulder. I went to the pain clinic, had an X-ray taken, and was diagnosed with inflammation in the shoulder tendon.

It's been over a month since I received an injection targeting the tendon under ultrasound guidance, along with physical therapy and medication, but there's no sign of improvement. I also visited orthopedics and neurosurgery, and they told me after examining X-rays and listening to my symptoms that I might have a rotator cuff tear or frozen shoulder... I'm still not at that age... 😢

Are there any others who have experienced symptoms like mine?!

What should I do?!