What's that one thing that made you believe that you would crack this exam?

People with such strong backgrounds, prestigious jobs, and great opportunities have started preparing for the UPSC exam. What was the one thing that made you believe you could do it? How did you counter the fear or thoughts of not being selected?

I want to prepare for this exam, but I'm afraid of the possibility of not cracking it, given that there are only around 1,000 seats available. Could you please share some of your belief stories? I really need to hear them. The fear of failure is something I’m struggling with.

A little about my background: I’m a 27-year-old unmarried male from the unreserved category, working as a Senior Consultant at a Big 4 firm with a 20 LPA salary. I graduated from a Tier-1 college.