"Natural"?

I have made up my mind, but unfortunately my body has memories. Inappropriate thoughts flash through my head, and at inconvenient times. I have always been bad at reading people's true intentions, so I always assume nothing more than exactly what is said. Also, I think that people aren't aware of what their bodies are/are doing most of the time. However, I really just wish my body didn't react so quickly to theirs. Luckily it's merely internal feelings, but those feelings bring me trouble, and I wonder how I can make them stop.