Turning into an old turtle

After living for the past 30 years, without my conscious knowing, my body has turned into a wrong alignment. My postures, when walking, standing, eating, watching tv, hands on my notebook....all has become a critical issue which now I just realized that I need to correct them...and the process is hard and uncomfortable.
The problem is..my back has always been used to the most comfortable and lazy way of sitting by leaning on the sofa or anything that I can rest my back. Somehow I found sitting on a lazy way is more comfortable as compare to sitting up straight like a pole...boring...so curvy has always been the favorite choice...until I was recently being told by a doctor that if I continue to sit like that, I'll become a hunchback man when I getting close to 40 year old. That was shocking as I always noticed the old woman living next to my house who walks with the head facing down and I couldn't imagine myself turning into someone like her in my later year. So I need to change now!
There are many symptoms for someone like me who has being sitting in the wrong position for decades. Shoulders slightly pointing forward, neck and head pointing forward, back hunching...as you can see the whole picture of a turtle.
In my new changes, I will make sure my backbone is straight whenever I sit, the chest will be slightly forwarded, and the two torso arms slightly back warded, neck straight the head follows....in the beginning of the changes, backbone felt aching as time past 10 minutes and the urge to lean back hunching is very addictive.
Must bear the pain and gradually will withstand longer, more relax and without noticing the uneasy feeling on the back body. The best way to beat this bad habit that I discovered is that...whenever you feel like hunching, visualize a turtle walking with your head on it then you'll stop immediately. It works for me so I do hope it'll works for you. Advice: Seek your doctor or any medical specialist and ask for remedy if you are one of the old turtle wannabes like me...there's always a way to change for better and healthier. Act now before too late...as the old saying...whenever there's a will there's a way...