I'm great at explaining my actions -- but I'm not great at explaining my reactions. If that makes sense.
I try to decide things based on some kind of calculation, but my reactions to things (especially my internal reactions to things) are tough for me to figure out. I can explain them very well after I think them through, but that could take days, weeks, or even months.
Edit: This is under the presumption that my reactions aren't something I choose, but that actions/decisions are. So TLDR I have no difficulty explaining my decisions.