Not really claustrophobic

I used to be claustrophobic, but I've outgrown it. But I do still have this weird way of being in crowds. I find people very interesting so I like to watch them and observe how they interact with each other and their environment. Unfortunately the longer I observe, the less "human" they become to me. They just become nameless organisms like any single celled organism in a petri dish. That's when I start to get uncomfortable. I don't really freak out about it, I just get an uneasy feeling that some organism will start to devour all the others.