You say your boyfriend is funny. As someone who has tried to be funny their whole life, I would guess that he won't say he loves you because inside of him is a frightened and sobbing little boy. Or, if he's more "Dave Attell funny," a bitter alcoholic.
Humor is often a mask for deep emotional issues. I myself use humor to mask my crippling fear of social interaction and my raging chlamydia. Trust me, nothing smooths over the "morning after" talk like a good chlamydia joke.
Try not to put so much weight on those three little words. He's clearly preoccupied with them, and making a big deal out of it is just going to make him more anxious. Chances are, you KNOW your boyfriend loves you, because of the way he acts around you, the things he does for you, the ridiculous clothing he lets you dress him in.
Then again, while there's no desperate need for him to say "I love you" for you to feel connected, there's a limit to what's reasonable. Everyone's entitled to a little commitment phobia (especially men; it's our birthright), but if your guy is excusing himself to the bathroom to avoid saying it, or if he still hasn't said it six months from now, that would arouse my suspicion, either that he's feeling guilty about something he's done or that he has a form of reverse Tourette's that precludes him from saying "I love you."
Lighten up for a while, and try not to acknowledge the yawning, awkward silences after you say "I love you." Say it when and because you mean it, not to hear it in return. If he's still being coy after a couple weeks, he's probably not that into you or a complete coward. Or both; we do that a lot too. The trick is to protect our egos by treating us like strong, capable men, while at the same time ignoring our irrational, child-like fear of commitment.
God, we kind of suck, don't we?
It can also feel awkward to say "I love you" when you haven't entirely worked out your feelings. I did that with my boyfriend. He said it for the first time, and I said it back to fill the void and because he looked so happy and excited. I knew I liked him very very much but sometimes I have trouble sorting out and consciously acknowledging my feelings. After I said it, I felt awkward because saying it is making a commitment. If you say it without meaning it, its the worst kind of lie. As it turns out, I did and do love him and we've been together for four years but it would have hurt both of us so much more if it hadn't been true and we'd broken up soon after than if I'd never said it. I guess my point is that you saying it occasionally is hopefully enough to make him think about it and decide how he feels, even if he doesn't know how to say it, and I'm sure one day he will
Go with what you are feeling in your pants...I mean heart.