I feel you Mimi, that's exactly how I feel whenever I'm thinking I'm going to wash the dishes and my mom tells me to go wash them even though I was already in the process of doing so out of my own volition lol
I swear there must be a name for this in psychology(when you intend to do something but then someone tells you to do it and then all motivation leaves you)
I'll be honest, I don't get this behavior. I've always wondered what these sorts of people think when someone tells them, "Never kill yourself." Do they suddenly want to kill themselves?