Depends, I have a few 'circles' (trying to say that without sounding like a dickhead)
In one I'm the shy one. Like, really shy.
In another, I'm sorta loud, sarcastic, takes the piss out of everyone etc...
In another, I'm the nice one - my main role being someone for people to trust and talk to
In another, I'm pretty much, the witty one
In another, I'm like the least cool one - I get along with everyone, but I'm not as cool or 'cool' as them.
I think that's it. My personality changes drastically around different people.