Change my image?

I have a stoop in my neck and was wondering if that can ever be reversed so I have good upright posture, or is my posture "set"?

I do not want surgery, it's not that bad, but it is noticeable and I wanted to correct it with exorcises and the like. I've been to an Alexander doctor, once, but didn't think to ask.

I was basically wondering if I could change the outward appearance of my neck and back's appearance?

Many thanks.