Looking for advice!

In a little over a year I'll be 40. I'm unmarried, single, childless, and friendless. I'm depressed and overweight. Overdue for a promotion. Still renting. I've been working on all 8 things for the past 5 years, trying to make some improvement, but I'll make a few steps forward and then take several steps back. Why??? My life is not as terrible as it seems, btw, but what gives?