believing that we have to fit in is the real pressure on us

Socializing requires us to abide by the laws, regulations and tradtions of others. If we act in a way that does not conform to these we are labeled unsociable at best, often something much worse. Most of us strive to fit into the culture around us, while trying to retain the things that make us the individual that we are. We don't want to become clones, but most of the time we don't want to be the focus of all the attention. It causes us to walk a narrow line sometimes. This makes some people very anxious and others just retire into their own bubble and ignore the rest of the world. There are, of course, many other things to be said about this, but that is a short form of my opinion.