Anyone got any tips/been to see a chiropractor to have their posture corrected?

Not sure if im just being paranoid but i've noticed in a couple of recent photos that im rounding my shoulders a bit. Im pretty tall so i dunno if im getting that way through years of sub-concious hunching to compensate for my height?

Not a total hunchback or anything but i wouldn't mind hearing tips on how to teach myself to stand up straighter.