Why doesn't my boyfriend ever kiss me?

I'm shy so it's hard for me to initiate kissing. I have asked him for a goodbye kiss a few times, but all he gives me is a little peck. We've only truly kissed one time the first few weeks after we met, and we've been together six months now. He loves to snuggle, but he just will not kiss. I don't get it. What's wrong? And he never really openly says he loves me (only once) or calls me honey in text messages once in a great while. I have social anxiety, so it's hard for me to call him pet names or kiss or say I love him when he doesn't ever initiate it, and talking about it just feels awkward. I don't want him to kiss me just because I want him to. I want him to kiss me because he wants to.