Everyone I see would say I am extroverted, but in reality I have learned to pretend in social situations. A lot of that list I can really comprehend, and I honestly feel any social part of me shuts down when I am in a room with more that 2 or 3 people (also depending on the people I am with). I am sharing a flat with about 20 people at university, and it's really helped me to come out of my shell a little bit. I am really lucky, my flat isn't the "party" flat as such, but we are all kind of the same.