Don't let other factors force you into dieting. The best motivator and the best weight loss secret is simply WANTING to do it, and nothing should stop you from getting to where you want to be.
I started off at 248, I lost 90 pounds, and then I binged back up to 252, so I understand how it feels. And for 11 months I said I HAD to do it again. Nothing got me to start because I didn't want to. Then I just finally decided to want to change again.
It will be hard, but that's why you have us to complain to!