Internal Dialogue: What Am I Doing Here?

I had the daily mass at a local parish this morning.
Though it has become a more routine thing, I'm still very self-conscious while I say mass. And today, like many days, there is still that voice in my head saying, "How is it that I'm up here, doing this?" As I sat in the presider's chair for some moments of meditation I wondered: Is there a point at which this becomes second nature? A point at which you are so used to it you don't even think how odd it is that here I am a the altar praying these prayers?
The thought is reassuring, but it is also accompanied by the concern that I would never want this to become just one of the many things I do. I hope there will always be room for a consciousness that this is something special. But I'm jumping ahead . . . for now it is strange, and wonderful.