While I think it's good to take a look at the "Why did I get so overweight?" it's a bit overwhelming when you're just getting started losing it.
You're where you're at, and you're taking steps to change it. That is a MAJOR step!
As you adapt your life style while losing weight, the why's will become apparent - and really won't be as important since the changes you're making in
diet & exercise re-fine-tune your thought processes and will become the habits that you'll need to remain fit.
Best of luck to you and welcome to the WLF!