Posture and grace

Those who do not know me personally think it is a little strange when I say things like "I am an awful girl", but the truth is I have been a tomboy my whole life and never really spent any time on the "girlie" things that most women have done. Truely I think I was over 25 before my first mani/pedi, wow I was missing out. So now I have an interesting problem that maybe some of you who have had more time on stage can help with. My posture is not the greatest (diagnosed with scholiosis and lordosis as a kid) but I can straighten up for the poses it's just not natural to me. Needless to say after all of this work and 46lbs of weight loss I still look like I have a lower ab issue when I am just standing up. Disturbing to me since I actually have a six pack. I have worked really hard to get here but I truely don't know what I am doing wrong or what to do to fix it. Does anybody know of a good site or tips to help with direction for me?