I suffer a lot from procrastination and I think one of the reasons is that I find it still a hard to write code. Which most of the time is not coding but reading and trying to understand code. And thinking about all the alternative ways to solve a problem. I often find myself struggling to commit my changes doubting whether my changes are good.
I also still find myself looking up the order of the parameters of standard C library functions that I have used over 30 years. I am dyslectic and struggle to remember facts. I also still find myself making stupid Boolean logic coding errors and make one-off mistakes. I still find myself stepping through loops with the debugger just to see if I did not make a stupid mistake.
It still often takes me more time to solve an issue than I had thought it would take me. There are days when I leave the office feeling that I have accomplished nothing because I have not committed any working code.