Low Self-esteem... I really don't like myself?

Alright, so since I was little I grew up with my grandparents living downstairs. I love them both, but my grandfather would always say "Alyssa, you're fat" or "Alyssa, you're ugly" and then my grandmother would get angry with him and he would turn around and say something like "See, now she is angry with me. Look what you did!". I'm 15 now, and I really do hate myself. every guy I have ever liked has always gone off with my friend instead of me because she is prettier and had DDs. My body size is really weird, im a 36" chest, 26" waist and 44" hips... I feel fat all the time... and no matter what people say I really find myself ugly. I have a great boyfriend who says I am the most beautiful thing in the world to him and that, while Cie (my friend who gets the guys) is pretty, I am beautiful.... But I still find it hard to believe him. I know that what my grandpa said to me from age 6-12 was wrong but for some reason I still think it's true... and I suppose I will post a picture to show you guys that im not all that pretty. http://s994.photobucket.com/albums/af68/Lestatrox/?action=view¤t=stuff104.jpg and this is cie http://s994.photobucket.com/albums/af68/Lestatrox/?action=view¤t=12464_337337530620_837175620_100093.jpg