Boyfriend problems

So I've been seeing this guy for two and a half months and we are really close but...I don't think I'm physically attracted to him. I really like him and I want to be with him but I'm not attracted to his appearance, which I kno isn't a big deal and it's not, however, I don't find him sexy and he doesn't turn me on so I haven't been wanting to have sex with him. We haven't had sex yet because I wanted to wait until I was sure I wanted to be with him but now I'm sure I want to be with him but, I can't get myself to be turned on by him. I'm just not attracted to him like that. What do I do?