What do I think about?

What do I think about? What's inside my head?
Is it an everyday thing to think of you?
What are you doing today? What are you thinking of?
Well, I wonder what would I think about if I didn't have you.
So, what would I think about if you weren't always inside the back of my head?
What would I care about so much it would have me going crazy?
What do I think about when you're not around?
What do I think about when you are away? Is it an everyday thing?