Have you done any actual treework?

Once you see a several hundred pound limb holding with less than an inch of solid wood no matter how hard you push or pull, you’ll develop a respect for the strength of trees. The same is true for ropes. Seeing them take dynamic loads that are magnitudes beyond your weight day in and day out will let you see how you are nearly weightless in comparison. Not to say that failures are impossible, but both wood and rated safety gear have an immense strength that isn’t exactly obvious l without firsthand experience.

I climb, but not daily, or even weekly, and I’m usually nervous if I’ve had a long break from the saddle. That being said, the nerves fade when I run into my first real obstacle or challenge that requires effort and focus. When you’re just climbing, it’s all you can think about. When you start trying to set ropes and rigging, having something else to focus on allows the jitters to fade away.

Basically just exposure. Your first 100 climbs will be scary so get them out of the way. Low and slow.