I am not a natural leader either. Nor do I think there should be human "leaders" in a Christian sense.
I can relate to the above experience--I was appointed a Ministerial Servant when I was still a teenager. And I tried to regular pioneer for a time. Sometimes I would conduct book studies when the book study overseer could not, or was called to other book studies to conduct. And, of course, I had to take the lead in field service sometimes. And yet, there were brothers there in their 50's or older…not to mentioned mature sisters. I felt like a fraud and an idiot. I never had a thirst for desire or prominence. I felt that many congregation tasks could be easily done by sisters.
Often, the organization's main qualification is field service hours and a Y chromosome. You could be incompetent in every way, and not scripturally or practically qualify in any way, but if you have those, it's good enough for the hierarchy.