Am I normal? What can I do?

I'm an 18 year old female and have no interest in sex whatsoever. I have no idea why. I enjoy other physical aspects, such as cuddling and kissing, but anything else and my interest is zero. I'm in a relationship at the moment, and naturally my boyfriend wants sexual activity. When I explained how I felt, he was obviously hurt and called me an 'asexual' which I am not. I like relationships, and what I mentioned above. I'm not frigid... when it comes to intercourse I'm not afraid, anxious or worried, my mind just goes void and I think of something else, which to me is more interesting and less monotonous. No, I wasn't abused as a child or anything like that, and I'm not a virgin. I've had sex once, and to me it was dull. I didn't enjoy it. I dislike being obviously sexually touched, though I don't mind sexually touching. Is this normal? Do you know what I can do? I've been told that 'it's just a phase', 'it's because he's not the right person' (he is) and 'to get over myself'. I really want to sort this because I want to please my boyfriend, but he insists on me being pleased too (bless him <3). Please help!!