Even your parents don't know? Can't they tell you get very anxious?
My wife knows about my problems. She's had to deal with me for a long time and had to deal with the consequences after I've been off on some crazy manic episode. The anxiety she isn't so aware of I don't think - but that's probably understandable as I hide it very well and I can talk more than she does. I'd say my situation is very different to yours - that must be hard to handle.
My son knows too - but he doesn't really even want to hear about anxiety. He doesn't mind talking about the bipolar though. I think anxiety makes everyone uncomfortable, even to talk about. Friends don't really get it at all - I can tell. They have trouble believing me though as I only tend to see them when I'm feeling okay - and then I'm just like them.