I don't quite understand....you want him to think of you more? You want to be on his mind constantly?
Really, it's healthier when your every waking thought ISN'T of the other person. It shows your realtionship is healthy because you have a life outside the relationship.
If you're happy you shouldn't need him to be calling or texting or thinking about you constantly. I'm assuming you're fairly young given the fact that you wrote that you're 'going steady'. Remember, boys aren't the center of the universe, and you're not the center of theirs.
Live as if you were to die tomorrow. Learn as if you were to live forever. - Mohandas Gandhi