Just to possibly help put things in perspective and ease your guilt, when your parents were entering the job market, a person with a high school education could land a job with good pay, and someone with a bachelor's could make a killing. Nowadays, it typically takes a master's to make less than the good money people were making before with juat a high school diploma. Almost everyone I know has a degree, and they're all underemployed.
If you brought a child into the world and the bottom fell out of the economy, I'm sure you'd be understanding, and I'm sure, on some level, your parents are as well. Things are bad right now for all but 1% of the country (unless you're from outside the US, but things are also as bad in most of those places), so keep trying, but try to take a little pressure off yourself. We're all in this dire economy together, and we'll survive.
I believe strongly in life taking drastically unexpected turns, and every now and again, they're for the much better. I'm trying to find a way to share my story with people whose romantic lives aren't going well, in a way that won't seem like I'm bragging in any way, but it went from an F to and A+, and it happened late for me. It hurts me to hear young people so close to giving up, because I would have missed the best life had to offer had I done so.
Not making it about me at all, I just feel that what I have to offer, I draw from my own past experience.
My approach when I hear these stories is to strongly encourage those whose situations are changeable to keep hanging on. I do believe in a person's right to suicide, but in your case, the change of environment I'm sure you'll eventually get could and likely will make all the difference in the world. Until you can support yourself, I hope you feel less guilty and begin to see just how beyond our control current financial circumstances are; 99% of the country is competing for crumbs while 1% owns the pie. This isn't your fault. I'm sure you'll find something, but try to clear your head and feel better about yourself first. You're not a leech. You're someone who's having trouble finding his footing like millions of others are right now.
I wish you all the best and will be here if you need me. Keep your head up, my friend.