Nothing is unusual about the Camino - it is what is and you get what you need not necessarily what you want from it...
I've met pilgrims who took a decade or more before they took the first step along the Way and others who only decided the previous month/week/day and set off totally unprepared yet full of belief. Pilgrims who had trained for years and those who had never walked any distance in their lives. Most of us fall somewhere in between.
Our trio took 5 years from the initial seeding (Martin Sheen has a lot to answer for!) to undertaking the actual walk. Work, family caring commitments, other planned treks, funds and training took up the space in-between.
I'm in awe of your journey so far, overcoming both physical and well intentioned concerns... and facing off with your fears... naming them is a great start as you are already growing beyond them. I realise that fear of failure is a big concern and I truly hope that you will find that the journey itself becomes the destination and, as such, there can be no failure.
Buen Camino!