It sucks when people don't get it, especially family. But you know it's not true, and absolutely doesn't make you any less of a person if you can't just get over it. The fact that this website exists and has so many members goes to show it's not as simple as mind over matter. If it was we wouldn't need this place.
I'm glad you can feel safe to post and I hope you receive better support here at least. Maybe in time your family might be start to get it, but until then we will be here for you