(Concern) Excessive worry about shoulder stiffness

I am struggling with severe shoulder stiffness. Recently, a friend massaged my shoulder and said they've never seen someone so stiff before...

My shoulders are also very painful, and I experience stiffness in my neck, back, and waist. It hurts and becomes very exhausting when I stand or walk for a long time. Additionally, even in summer, my hands and legs sometimes feel cold. I believe this is because of poor blood circulation due to shoulder stiffness, so I am really worried and concerned...

I am considering going to orthopedics, but I would like to try if there is a way to solve it myself. If there is someone who has tried it themselves and seen an improvement in symptoms, I would appreciate it if you could share the method!