What makes me a fangirl is a difficult quesiton. Its diffrent for everyone. Some people dress up and go to comic con and all this, but me, I don't, I live to far away from all that. What I do do, is run a blog about all the nerdy things I fangirl over. Which is mostly books and Doctor Who. So, I run a blog, and go to the midnight premires and dress up and squeal and stalk twitter, and buy things the day they come out, but to me, what really makes me a fangirl is that I honestly love what I'm blogging/screaming/crying/waiting about. Even if they make me mad/sad/happy/depressed/infuriated, I'll never stop loving it and it will always be special even if being a fangirl is weird/stupid/immature.
Love what you do, do what you love.
:)