Why can't I be your dream girl?

My boyfriend told me I am not his dream girl regards to body type. I am a 7 out of 10 in his eyes. But he says there is more to being with me than my looks... but how do I get around that he isn't really attracted to me physically? I just don feel like enough, like someone who is there so he is not lonely... but the other thing that confuses me is he want to marry me and have a family with me. I just don't get it... help!