I've been there a few times, though I had some previous use cases as tools in my selling bag so it was a little easier. If there's one thing I've learned from my years of selling it's to keep firing until something hits. Keep taking shots and don't stop, eventually someone will listen to you (Sometimes it's just because you won't go away) and that's when you can really start communicating. It's really hard, though (For me, anyway, and I've had some good successes but it still feels like some other guys make it look easy). Like entrepreneurship most people are not built for sales.
I can't give any advice on your life situation and whether or not it actually is time to stop or not. My default position is set to 'Never give up'. If you're having trouble getting through to someone inside a prospect company, jump to the top of the chain - I've called/e-mailed CEOs on more than one occasion when the right person to talk to was someone in middle-management, all that ends up happening is they take my call and pass me down to the person who makes the decision. Once you've been passed down you're much more important to the person you're talking to than if you've been working your way up the chain (Sometimes that works, too).
At a quick glance it looks like a sales problem, though. Keep firing. The first big sale is a huge adrenaline rush, especially after walking through the Valley of Death.