The invisible self

I know your name,
I've seen your face,
I'm here, I'm there without a trace,

Who am I?

I'm lonely and I'm sober,
I'm innocent, confused,
Someone You've forgotten, someone that you've used,

Who am I?

I've watched you take your downfalls,
I've been there through it all,
You'll never even notice, But I'll catch you if you fall.

Who am I?

One day you'll be unlucky,
I'll dissapear from you,
I was there, but now I'm gone, you never even knew,

Who was I?