I know I am guilty of this, and I bet most if not all of you are too. I have in past weight loss journeys had the idea that when I got skinny, I would magically be happy. Like it was a magical spell or a wish from a genie, and POOF all will be fixed in your life. I have been the guy with the big weight loss. Trust me when I tell you, your life is still your life when you get skinny. If you were frustrated in your job, friendships, family life, etc. it doesn't just go away. Life goes on as it always does, just now, you have a physical transformation.
But it isn't all bad news. Once you get skinny, the problems may still be there, but two things have changed. First of all, you may not have fixed ALL your problems, but you did fix ONE issue in your life that likely has been giving your grief for a long time. At the very least, when you have reached a weight or fitness goal, you dropped off one of the things that keeps you awake at night. Another thing you have done is to equip yourself with a tool to deal with the rest of life's troubles that can wear on you. Had a bad day at work? Rather than coming home and binge eating on junk as a coping mechanism, now you have the option to strap on the running shoes and go run off the crazy, or hit the gym and get a good weight work out on. Because we all know how the binge eating solution ends up.... you having had a bad day AND and bad evening in the end. None of us have ever said "I really regret that great workout" but we have all said, "I can't believe I at the whole thing" (you may or may not get that joke).