I live in a suburban area that used to allow me to do a thirty mile ride any day right from my driveway. Today, I put my bike in the car and drive ten miles to a rural area and ride from there to stay out of traffic. I'm blessed. Sounds like you are almost forced to ride with more traffic than you're comfortable with. I would be too.
Any chance you could finds me better area in which to ride? Even if you have to drive there with the bike? Good luck.