Again I don’t know what I’m doing wrong.

I’ve been unemployed for a year now, and at the point of pulling money from my 401k, I’ve been revamping my resume every two weeks or so. I get some interviews and screw them up.
I’ve applied for out-of-state and even sales/application engineering positions. I’m lucky to be living with my parents, but my dad is old and still working. My entire life, my parents and I have been living paycheck to paycheck. I went to school to have a better life and so he can retire, but at 69, he’s still working. I have my wife and son, along with my parents, to support. I’m so lost.