when your best isn't good enough

What do you do when your best doesn't cut it? Sure beats the heck out of me! As a mom I try hard, but I feel like I'm coming up short quite often. As a wife, I feel like I try hard, I work outside the home, I cook, I clean, and nothing is enough. I don't make enough money, I don't cook enough to avoid eating out and enough for leftovers, and the house still is a mess! Sometimes I feel like throwing up my hands and giving in to my selfish urges and just quit trying. However, I know that won't solve anything so I keep plugging along, forever behind.
Now if it were just me that this affected, I could handle it. However, it doesn't affect just me, if affects my whole family. Obviously, the parenting decisions I make affect Dani a lot and the house and cooking really, really affect CJ as a messy house and money spent eating out stress him out a ton. So what do I do? Do I cut out the time I set aside to care for myself? Should I sacrifice my "down-time" to work on the house, therefore having a cleaner house (and a happier husband) but a more haggard life? Or do I just keep plugging away and hope things get better?
Is there a solution or is this going to always be my life until we're empty nesters? (what a depressing thought)