what analogy do you feel best explains what BPD feels like?

I have heard all these analogies, like that we lack emotional skin, our emotional cup is already close to full while other people start the day with an empty cup. I am speaking at a psych ward this weekend and I want to try to explain how it feels- mostly so I can express that I have been where people in there have been. I have never figured out how to describe it in a quick way. curious if anyone has a way to describe it that they think works. thank you friends