This is exactly why I don't talk to family members about...well, anything.

I'm sorry she didn't understand, or at least validate you. Personally, I get everything you mentioned about the job because I struggle with my job too. People don't get why. They're not socially phobic in a sales position. :|

Some people don't have the capacity to empathize either. So don't be hard on yourself...feeling the way you do is valid. Her reaction means she just can't bridge to empathy.