Weight Loss Struggles

I've been fighting my weight for years. After I had my son almost 4 years ago, I weighed in at 245. Not healthy. Then one day I watched The Biggest Loser results show, and I thought "Some of those people are bigger than me. If they can do it, I can do it." So I started exercising and eating better. That's been my routine for the last 4 years. I go through spurts of exercise and eating better. Then I kind of let it go for awhile. But the times when I let it go, I feel awful. I'm tired all the time, I get winded climbing the basement stairs, I don't have any energy to play with my kids. And I eat so much more than when I'm working out. It's not that I try to eat salads all the time (I'm not that fond of salads), I just don't eat as much. So it makes you wonder why, if I feel so much better when I'm trying to take better care of myself, don't I keep at it? That's a great question, and I honestly don't have the answer.
But this morning I woke with a newfound determination! One that I haven't had before. I've been determined, but it's never felt like this. I just want to be healthy! I just want to be able to be around for my family. At the rate I'm going, I won't be. So I weighed myself Sunday morning and I was at 206.8. My goal is to be at 180 before my birthday (that's January 26 if anyone's interested). I'll be 30, and I want to start my 30s at a healthier weight. My ultimate goal is to be around 160-165. I'm going to weigh every Sunday (provided I remember) and blog it. I have to be accountable for my actions!
Here I go! Wish me luck!