Sorry to hear that Bob. Clipless pedals are hard to get used to. Don't let it stop you - you can switch out to the older style pedals fairly easy.
When I was in my teens, a friend and I did two 1,000 mile self-contained bike trips... back then we used the old metal "rat trap" toe clips with leather straps that you could use with any old shoe. My wife and I have touring bikes (mine is a Trek 520 and hers is a modified old Trek hybrid) and mine came with modern SPD clipless pedals (like you used, where you have to have the special shoes to hook into the pedals). The theory is that they are more efficient, since you're firmly attached to the pedals all the time and you can not only push down on them but pull up also as you rotate the crank.
They're called clipless
pedals, which is kind of confusing... since you still have to sort of "clip" the shoes into your pedals. The trick is when you start to slow down, or at the first sign of trouble, you must almost unconsciously rotate the back of your shoe outward to snap out of the pedal. Wait too long to do that and you're eating gravel.
For that reason, I switched back to the old rat trap clips on my bike with platform pedals. Could never get used to the new pedals.
We took a short bike trip a couple of summer ago in Wisconsin, packed with tent, food, cooking supplies, sleeping bags, CPAP and a bunch of other stuff for the trip. It was fun, but very exhausting in the Wisconsin hills.
Here's a picture of my bike, minus the front & rear Ortlieb panniers (saddlebags) we used for our trip:
Just noticed the Tour de France is on the tele just now... got to sign off.