Awesome advice above...
Your body is exactly that, yours. Like WildChild said, get to know it.. yes, your body is different, its different to mine, its different to every other womans.. thats what makes it so beautiful, it is in no way ugly.
As a woman, im happy to say that i find the female form twice as beautiful as the male... we've curves and dips and indents and nooks and crannies everywhere

...and if i didnt like men so flipping much, i'd swing the other way...
You are lucky, you have a man that wants you, wants to be with the 'whole' you, he obviously loves and yearns for your body...and its almost as if your depriving him... he will pick up on the fact that youre not feeling anything and thats bound to dent his confidence.
Do this for him, like WildChild said, it wont happen overnight... whilst your in front of that mirror, write in lipstick on it - 'my body is stunning'
Sex shouldnt be a chore. Refrain from intercourse until you are secure about your entire body, let you boyfriend know what youre doing and how you feel.
Good luck honey, goddammmit - you are missing out on a good thing...