Yup, I don't always want to be cuddled, I sometimes like having my own space. I'd talk to your boyfriend about this, explain that you'd like to have a bit of time to do your own things but that this doesn't mean that you like him any less.
If you feel comfortable with becoming sexual in the first week then I don't see the problem. Yes, some people will think it's disgraceful but if it felt right then I think it's fine.
As for him liking you a lot more than you like him, talk to him about this! You might be surprised to find he is thinking the opposite. Communication is key in a relationship so please do talk to him about how you are feeling.