Get yourself to open up to him. Find your common interests and spend time doing those activities with him together. It would be best to do it when you are alone with him, but if you're too shy then you can invite some friends over to join. If your boyfriend is the type who likes lending his listening ear, talk to him about your troubles (or if you're having a bad day). If its the dating part that makes you feel shy, treat him as your buddy and your best friend.