I also have social anxiety and this is exactly it (your comment). Most people say I come across as intimidating and it takes a long time for me to become "normal" around someone, and have been told that I don't show any emotion.

But really, it's because the only emotion I feel is fear, and I try very hard to hide it. That's it. Thinking about it logically, it makes little sense. Similar to how a person may have depression, and to the outer world, their worries/fears may seem minute; yet to that person, it's all about the feeling, and the feeling is very real.