This is real for me, I struggle with leading a team. I am getting better at it I think but doubt is a lifelong close friend so who knows.
For a long time my excuse was my loading times are to long and no one wants to wait for a slow leader. I recently did a minor pc upgrade and have improved that, so lost that excuse.
Another thing is not knowing the content well enough, always worried I am going to lead the team the wrong way in a mission. Or do the absolute wrong strategy for any giving situation.
One other cause, I broadcast in LFG sometimes and get no replies. This can make it hard to want to try and build team sometimes. But truth is sometimes you just can't find people wanting to do what you want to do. That's just life.
I do run them alot more than I used to. I found doing arcs, TFs and SSA that I know and enjoy is the best way to start getting comfortable leading. You don't need all the answers to lead and be prepared to ask for advice and opinions as you go if it's needed. But you can do it.