Me vs Unfinished Sentences

So. I have this fade-out tendency. When I just want to stop talking sometimes I just get quieter and quieter until I stop mid-sentence. It drives my family crazy! But, if I decide half-way through a story that it's not really worth telling, then I don't want to finish it. Also, sometimes if I start thinking about something else it just happens. Sometimes intentional, sometimes unintentional. Either way, they look at me with daggers in their eyes. It's funny what family won't let you get away with. My high school friends just adapted and moved on to something else. My family, they just startle me with a loud "WELL. What's next?".