Because I needed a place where I could write and no one would know about it. People know about it now, but I hardly write in it anymore anyway. I suppose it didn't really matter, because I had all of my entries set to private. Most of those I've deleted during one of my I'm sick of everything I do moods.
I actually don't really like to keep internet journals. I'd rather keep a written journal. Unfortunately you don't need a password to get into a notebook. And years of my mom reading my private things has ruined me and I don't trust anyone to not read it.
As for how introducing me... I think years and years ago I had a livejournal. Back when you either needed to pay for one or someone who joined was given a code to give one other person a free livejournal. A girl who used to like me gave me her code. Chya. For the life of me I can't remember what the username was.
Oh well.