I'm not attracted to my boyfriend?

Ever since before we were dating, I knew I didn't have any physical attraction towards him. The reason why I went with him was because of his personality. We've been together for a little over a year, and we're both 20. He has dated before and he's my first. We've never done anything sexual. When he wants to kiss, I bug away and I say I'm tired (I'm still new at dating, and kissing is still awkward for me, sadly lol). I know I'm a huge *** for this, because if my partner dumped me because they weren't attracted to me, I'd be so sad. He's such a great person. I know I'm a stupid *****. I've always thought, "personality over physical attraction". But when things started with him, I became a hypocrite. I don't plan on leaving him over a situation like this. But what do I do? How can I deal with this? Again, I know I'm a screwed up person. I'm so sorry.