Third times a charm

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Hellow all. My name is April. I'm a 33 year old mom of a 4 year old looking to lose 60 pounds by the end of the year. I've joined fitnesspals twice already and never stuck to it, so i think third time is a charm. Motivation is a big problem, along with cost of food. Why does it cost so much to eat right? I'm planning meals on a very tight buget ($30/week) for myself, son,and husband. But i think with th help of some wonderful fitnesspals who has been ther and done that, I'll find whqt I'm looking For and lose the weight.