I have this weird theory that the reason why we block is because when we were little we got the idea that regulating our own emotional state may regulate the other person´s emotional state. If we regulate them positively (pleasent emotions) they feedback positive responses; love, safety, acceptance. But if we regulate them the other way we may feel in danger. So we are on a constant quest of regulating our own emotional state to support the other people emotion. That is the main code that is embodied on our brain. That is the way we related to other people. Whenever our nervous system and brain predicts that the probability of regulating them positively is low, it actives the blocking mechanism in order to prevent our next movement. When you are alone there is no one to regulate so the neural pathway has no place to be active. The goal is to make the neural pathway inactive in the presence of other people. To do that, we need two things: 1) Understand the concept of neuroplasticity and how we can diminish a strong neural pathway. 2) To change our source code. Stop seeking to regulate other people emotions. To know that our own emotional state may contribute to the other people feelings but ultimately he or she has the final word. To feel accepted, loved and secure not by the other people being content but by our own rules. Hope it make sense. It is a nice theory.