Why do I sometimes feel not right...about my boyfriend..?

It's like, he's amazing. Perfect, even. But sometimes I just feel like I'm not ready for a relationship, but there's no way I'd break it off. I feel happier than I have in a long time. But like sometimes, when I just wake up, I feel like: "Do you really want to do this?" It's really hard to see him, and we've only seen eachother like once a week. I dunno. But he loves me, and I know he really does. Plus, I HATE showing PDA with him in front of my family. I will not do it, it makes me uncomfortable. Also, kissing him does that. (Although I've only kissed him a little, I'm inexperienced, he WAS my first kiss, and my first boyfriend) Any help ?