Nick names from school or Tags or account names or email address's are usually good things to call your self.
Other people can't really give you a name with out any info on you, perhaps you would be better to ask some friends to give you a name.
But if they call you some thing like tosser or homo maybe it's not such a good idea ;/ but it's a start
Uh, yah. You can change your name. But its pretty much useless having the person who changes it go through that much trouble when you only have 2 posts. So just go make a new account. NOW!