Hey Kraft Dinner! (I love that name - it makes me laugh ;p)
I know just how you feel. I have days where I just feel so worthless! A lot of my anxiety comes from the guilt I get for not being enough - not a good enough wife, not a good enough employee, not a good enough sister or daughter, not a good enough friend, and most importantly not a good enough mom. I keep telling myself that I must be ok because this is how I've been for the last 12 years and the people that mean the most to me tell me they love me and that should be enough, but I still feel guilty for not being a stronger person to be the kind of person I feel they deserve.
I haven't quite figured out how to beat this yet but all I can tell you is to try to remember that the people who love you, love you for who you are and not who they think you should be.
So, you keep trying to remember that and I will, too. ;p