Insecurities

I for one am extremely insecure about my boobs. They've never been perky or even standard. I'm very active and as much as I work my chest I've never been able to tighten the skin up there. It's the first thing that kills my excitement when I think about being intimate because it one of the only things I really dislike about my body :/
Does anyone else feel this way about parts of their body? If so how do you combat that?