I'm the same way bro and I've come to terms with the fact that this is how I was designed. I have that gap inbetween my pecs and they round out. I've tried everything I could, concentrated like a mother but you can't build muscle where there is no muscle tissue to close the gap. My pecs are they way they are and the only thing I can do is make what is there bigger. When I see those big square chested dudes with complete connection I'm just like damn lucky bastards!