I don't think I'm ready to meet my boyfriend's parents. But it seems so unfair on him.?

I'm sixteen and I have a boyfriend - Geoff who's twenty. We've been together for just over two months now, and he's been over to my place numerous times and has met my parents. However, his own parents have been away since before we got together and I haven't had a chance to meet them, but now they're back and everything is just piling up on me. See, I don't mix with people I haven't met before. I'm painfully shy, and tend to have minor anxiety attacks about these sorts of things. Not only that, I just don't feel quite ready to meet his parents? This has been my first long-ish relationship; and generally for me, it takes me a very, very long time to trust someone fully and to feel comfortable with them. And truthfully, I don't think I'm up to that stage of closeness with Geoff where I will be comfortable meeting his family. Admittedly, I think it was easier for him to ease into my family, as he was originally my sister's friend, and had met my parents before when he came round to hang out with her. We kind of share different view points as he's older than me; he's willing to meet my parents and he thinks that two months has been a long time, whereas I don't feel adequate meeting his parents and for me, the two months have flown by and they haven't made a solid, comfortable relationship. Another reason things are starting to get stressful for me is that I have a heap of homework to be finished this weekend - when he wanted me to meet his parents. So today I called him, and told him that I didn't feel ready because of all that. He said he was confused, but understood, and just a little bit hurt. So now I'm feeling guilty and horrible because my relationship maturity isn't where his is, and I'm severely doubting my actions. But the thing is I really don't think the time is right, but is it?