I think you've made a HUGE first step. And a second step. And a third step!
You've realized you need to change. You've DECIDED to change. And you've started to change.
So, tell us what else you'd like to do? Have you decided to count calories? There's a Calorie Counters area under Diet Central. There are also age-based support groups around. And I can personally say that, although you don't have 100 lbs to lose, the 100 lb club is open to everyone. It's quite an active & supportive group.
Have you thought about some exercise?
No need to do everything at once though. Simply writing down & being accountable for what you eat is fantastic. Small steps will get you to the finish line!
Keep on posting & best of success!!!