Nah nothing traumatic just depression/hypochondria/anxiety that hit me hard in my early 20s, I should have gotten help but I didn't. So I became a recluse for ~10 years and gained 250 lbs (180-430). I went to college, and work (both part time) during this time, and eventually I pulled my head out of my ass and graduated, got a good job, paid off A SHIT TON of credit card debt, and am saving to move, but yeah I pretty much spent my 20s working/school, and sitting in my house, my social life was gone (once in my mind I became fat, I stopped dating, I don't find fat women attractive, and I am not going to be a hypocrite, plus I wasn't happy with my own body).
I started dieting in fall of 2012, I got about 130 off by last fall then this year went a bit slower with 40 to 50 in the last 9 months, but upping my caloric intake, and doing HIIT cardio has been helping.
As far as the get even part is, its just bitterness talking, my 20s are gone, im alone, and feel I didn't get the life I was entitled to have (yes I know poor word to use). Again its the depression talking. So I just keep putting effort into me, losing weight, paying down debt, saving to move to portland or seattle, and hoping someday life gets better.
My therapist wanted me on prozac ASAP but it causes weight gain, so I quit going. I toughed this out 12 years so far, I think I can manage another 1.