Confidence issues

My boyfriend is absolutely gorgeous. Our relationship is great, we get on well, never argue, always have a laugh. There's just one thing that's bothering me. Me. I am extremely self conscious. I hate the way I look. Even though he tells me I'm beautiful I find it so hard to believe him. I feel worse about it because I feel like an embarrassment to him, as if people judge him because he's with someone so much uglier than him. Does anyone else have this same issue? Can anyone suggest anything so I don't have such negative thoughts anymore?