Energies

I believe that energies are a big influence on our state of mind. For example, at times, you're feeling quite well, then you enter a place with other people that aren't that well and you start feeling as bad as them. That happens to me so many times, it's crazy.
I just... I don't even know. I was feeling "normal", well, as usual I'd feel, and suddenly people arrive at my place and I just got nervous and confused. Nothing happened to me besides their arrival. Now, it feels like my evening is completely ruined. I wish I could get away from this things, but it's like I'm stuck, with invisible chains.