Oh, very good question miss Jo.
I would say in all honesty not much. I truly pride myself on being who I am and having friends that accept me for exactly that. If this question were posed to me in Junior high, it would be a much different answer. I was at that time being who I thought everyone wanted me to be. THis included my peer as well as my parents and other adults and figures of authority.
But in my day to day life now, i wouldn't say I would change much. I might be more relaxed about geeking out on people in the real world. XD No one really cares on the internet, especially on sites that are dedicated to it. But in the real world, unless you are talking to another geek, people give you this zoned out/'I don't care'/'you are so weird' look and move on to whatever the next topic of conversation is. This Doesn't really bother me and I do it anyway, but i try to keep it to a minimum. But at the same time, depending on who i'm talking to, there can me no censorship at all too.
I can't think of anything else really that I would want to do or be that I'm not already. But very good question to think about, I might come back to this later.
EDIT: I thought of something! I would dance to my iPod on the train and in the stations, and everywhere. lol. This is something I would do absolutely if i would not be judged, but I don't do today because people stare. I do bop a little and bounce in my seat to really enjoy my music, but I would dance outright if i could. lol