Sometimes I can feel energy

Sometimes I can feel energy other people is spreading around. Some people really likes to talk, others just wants to be heard and fell cared about. Also there is those that actually likes to gossip and find out any information they can use for it. Some people likes to steal your energy... And sometimes I can feel your energy and feel you, and sometimes you scare me and I can't say anything at that time, because I don't fully understand it. Those are the times when you ask me: Why are you so silent?