I was like you before I joined fatsecret. The most I lost was 5 lbs and then it would come back. I thought I was eating better and exercising more, that is, until I started journaling my foods and exercise on fatsecret. At first I was horrified to see little "tricks" I heard about to help me lose weight (such as snacking instead of a bit meal) was actually causing me to eat more. Once I was religiously journaling I identified my problems and corrected them. I didn't have to go on a diet, just cut out bad habits and I found an exercise I love and participate in religiously because it's fun.
For me, some of my problem areas is I had no idea what an appropraite portion size was, how much a person of my size and activity level should eat in a day, how terrible feeling my feelings were. (That was pretty easy to give up, knowing I would have to 'admit' to what I had done on FS).
I also felt I didn't have the time to exercise, but then I finally realized I don't need the time to exercise, I can incorporate exercise into my daily routine, whether I'm practicing a dance move while brushing my teeth or in the shower, or doing pilates while watching t.v.
Don't give up. I thought it was impossible for me. I've lost 25 lbs, and it's stayed off for 4 months and counting.