I just wasnt built for uk weather, ever since i was a kid. Dark days in the winter are too gloomy. I think you right, we can adapt to almost any environment, the body can appear like a miracle some times. And true again, we do have tendency to see the grass greener on the other side, and never dealing with problems regardless where we live. 
UK is extremely over rated, weather awful, everything really expensive. Whether i am or not just carrying my problems with me, Id rather deal with it in a nice pleasant sunny place, thats affordable, thats not so crazy woke.