FWIW I walked off the base for the last time at 39. I'm guessing that is a little younger than you are now. What is past is done, always look forward to what is to come. Don't hang on to the past because it plays no part in your future; keep the memories for sure but they play no part in the rest of your life.
I'm 59 now and although it's nice to reminisce on fora like this I wouldn't recognise the person I was when I left twenty years ago. Times change and you have to change with them, either that or hang on to the person that you no longer are and become a caricature. The past is a safe place to hide but the future requires a little more bravery.
Good luck, it's a bright world out there so grab it and make the best.