You

I can be sitting in a room full of people,
and not be noticed by one.
I sit there and everything just moves past me,
I look around and see nothing to look forward to,
But then the door opens and as I look,
There you are standing there.
And right then at that moment,
My world starts to move,
It feels like I'm spinning around and around in circles,
and nothing can stop me,
And its you that makes me feel this way,
You make me happy.