It seems the more crowded a place is, the quieter i become and somehow something in my head doesn't have the energy to stay interested in something. I would if it's necesarry, like if it's confirming something, communicating something important. But other than that, i would go into this state of which the noise around me is interesting than the sound of conversations happening infront of me. It would take tremendous energy for me to stay enthusiastic and focus on what they have to say and respond accordingly. I had this since i was little, but more often than not, it makes people quiet down when talking to me. When ur smaller, people may think it's a children thing or something. But it seems to be a convo killer now. I still listen and say mhm or something, but it seems not enough?