How difficult is it for family members to understand social anxiety disorder, if they don't know what it feels like?

I have social anxiety disorder, and many of my family members think it’s some made up thing. They think I’m just too lazy to leave my house and participate in social activities like group sports. Even my own husband doesn’t get it. You can assure someone that it’s real and explain the symptoms only so much, but sometimes they still don’t get it.

Is it that difficult to understand having never felt the panic, or do they just not care?