Best decision I ever made in my life was to join the RAF and the second best decision I made was to leave 28 years later. Had a great time, went to lots of interesting places and made lasting friendships. I enjoy going to various reunions every year and reliving the memories with old mates. I would do the same if I had my time over again (although I would definitely not join what's left of the RAF I remember today).
Since I left I have had a number of well-paid, enjoyable jobs and I am now comfortable fully retired and enjoying the freedom. SWMBO and I have now lived in the same village for nearly 20 years (after many years of a 2/3-year posting cycle) and we have put down roots as well as getting involved in a number of local organisations.
So, the bottom line is look back with affection on what you did and now get stuck into civilian life with relish. As long as you have good health you'll enjoy it!