Thinking on the fly

I have a bad habit of replaying past interactions in my mind, whether they were casual conversations, high-pressure job interviews, or tense work proposals or presentations. It seems my mind is inherently desperate in some way to redeem myself, to undervalue my contribution towards a social interaction, to want to fill these lacunae with elusive thoughts that had entirely crossed my mind in the heat of the moment—a poignant question I could’ve asked, a specific and germane memory I could’ve shared, an intellectually stimulating idea I could’ve extrapolated on, or anything that would have likely contributed so much more to the conversation and my ability to get my point across. 

Is it my preference to thoroughly think ideas through before speaking, or is it merely self-doubt? Or is it solely a matter of practicing this form of multitasking between the flow of conversation and the flow of thought? My intuition tells me that it’s likely all the above.