I'm 45 and get along with people I work with - even come across as friendly and outgoing - but I have no friends outside if work. I was diagnosed bipolar several years ago, and I believe I am borderline as well. The BP1 diagnosis pretty much coincides with my extreme social anxiety. Part if it is veing terrified of social interaction, and part if it, honestly, is not wanting to be bothered. I love solitude, but I've got to learn how to let people in, and I don't even know how to start.