For some reason when I stand naturally, my shoulders tend to round over, and I looked hunched over. I've been told to do stretches to help pull my shoulders back. This problem, from what I hear, is most common with bench jockeys, but my training isn't the issue.
Also, my genetics in this area are horrible. No matter what I do I can't seem to put any weight on in my upper chest area, where my colar bones are. This contributes to the rounded shoulder look, and makes my lower neck/upper chest look skinny. My colar bones are almost as visible as they were when I weighed 140lbs, and I've put on 50lbs since then(5'11).