I'm an introvert, too, but I am also shy. Three of my children are introverts, only one of those is shy. I get what you are saying, though. It takes a lot of energy for an introvert in some situations. I remember my son, after helping me with a convention and having one woman occupy most of his time by talking to him. He learned a lot from that woman, and enjoyed the conversation, but at the end of each day's sessions, both he and I were ready to call it day. We'd have a quite dinner with just the two of us (not much talking), and then go to our room and relax. He said it was just a lot of work to hold up his end of the conversation and he was tired.