Sounds like he may be wanting something romantic or a reassurance that he means something more than a method of sexual gratification. Do some thoughtful things, like getting him flowers, surprise gifts, bringing him lunch at work if possible, go shopping with him, do homework with him. Maybe watch a movie he wants but perhaps you don't --- and actually watch it with him and pay attention without being too touchy, then talk about it with him. Tell him how the characters connected with you, that kind of thing, etc.
Tell him and ask him how you're feeling, about your day, tell him details you might not trust to most people. Ask him such in return.
Using reflective listening might help if you're bad at relating feelings naturally (I was taught it).
http://en.wikipedia.org/wiki/Reflective_listening
Spend some time together doing things you like that aren't sexually related on occasion.
More than anything you need to trust him. Showing him how you feel is scary, you're exposing yourself in a way you aren't used to. But he needs and wants that as part of the relationship.
It might be difficult -- but on the other hand, it also shows how deeply he cares for your relationship.
