"Nobody else truly understands." I suspect you are right, mrs.t.
Before I married, I thought I knew what it would feel like to be a wife. I didn't. Before I had any children, I thought I knew how I would behave as a parent. I didn't. Before I had PD, I tried to imagine what a physical disability would be in my life. I couldn't.
Even when we have good intentions and feel compassion, we cannot fully understand a situation until we are in it ourselves. That is one reason this and other forums are invaluable.